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Hidekazu Tanaka

Section

Graduate School of Science

Job title

Professor

Degree

Doctor of Science (Tokyo Institute of Technology)

researchmap

https://researchmap.jp/hidekazu_tanaka

J-GLOBAL ID

200901044216616540

Research History 4

2016/04 - Present

Tohoku University　Graduate School of Science
2005/03 - 2016/03

Hokkaido University
1995/12 - 2005/02

Tokyo Institute of Technology
1994/04 - 1995/11

Japan Society for the Promotion of Science

Education 3

Tokyo Institute of Technology　Science of Engineering

- 1994
Tokyo Institute of Technology　Science of Engineering

- 1991
Tokyo Institute of Technology　School of Science

- 1989

Committee Memberships 6

日本惑星科学会　運営委員会

2019/01 - Present
日本惑星科学会　編集委員会委員

2003 - Present
日本天文学会　研究奨励賞選考委員会

2017/06 - 2021/06
日本惑星科学会　運営委員会

2006 - 2010
日本惑星科学会　学会誌編集長

2006 - 2010
日本惑星科学会　学会誌編集幹事

2003 - 2006

Show all ︎Show first 5

Professional Memberships 4

Japan Geoscience Union

2009 - Present
日本物理学会
日本天文学会
日本惑星科学会

Research Interests 5

Homogeneous Nucleation
惑星形成過程
惑星科学
Planet fomation process
Planetary Sciences

Research Areas 3

Natural sciences / Space and planetary science /
Natural sciences / Solid earth science /
Natural sciences / Astronomy /

Papers 136

Modeling of Collisional Outcomes Based on Impact Simulations of Mars-sized Bodies

Hiroshi Kobayashi, Hidekazu Tanaka, Yukihiko Hasegawa, Shu-ichiro Inutsuka

The Astrophysical Journal　2026/02/10

DOI： 10.3847/1538-4357/ae1ef7 　
Modeling the Contact Surfaces Formed by Pebble Collisions: Application to Formation of Comet 67P/Churyumov–Gerasimenko

Misako Tatsuuma, Satoshi Okuzumi, Akimasa Kataoka, Hidekazu Tanaka

The Astrophysical Journal　2025/12/20

DOI： 10.3847/1538-4357/ae1fd8 　
Investigating the Bouncing Barrier with Collision Simulations of Compressed Dust Aggregates Peer-reviewed

Haruto Oshiro, Misako Tatsuuma, Satoshi Okuzumi, Hidekazu Tanaka

The Astrophysical Journal　983　(1)　75-75　2025/04/08
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/adbf04 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract The collision outcomes of dust aggregates in protoplanetary disks dictate how planetesimals form. Experimental and numerical studies have suggested that bouncing collisions occurring at low impact velocities may limit aggregate growth in the disks, but the conditions under which bouncing occurs have yet to be fully understood. In this study, we perform a suite of collision simulations of moderately compact dust aggregates with various impact velocities, aggregate radii, and filling factors ranging between 0.4 and 0.5. Unlike previous simulations, we generate compact aggregates by compressing more porous ones, mimicking the natural processes through which compact aggregates form. We find that the compressed aggregates bounce above a threshold mass, which decreases with impact velocity. The threshold mass scales with impact velocity as the –4/3 power, consistent with the findings of previous experiments. We also find that the threshold aggregate mass for bouncing depends strongly on filling factor, likely reflecting the strong filling-factor dependence of the compressive strength of compressed aggregates. Our energy analysis reveals that nearly 90% of the initial impact energy is dissipated during the initial compression phase, and over 70% of the remaining energy is dissipated during the subsequent stretching phase, regardless of whether the collision results in sticking or bouncing. Our results indicate that dust aggregates with a filling factor of 0.4 cease to grow beyond 100 μm as a result of the bouncing barrier.
Dust Coagulation Assisted by Streaming Instability in Protoplanetary Disks Peer-reviewed

Ryosuke T. Tominaga, Hidekazu Tanaka

The Astrophysical Journal　983　(1)　15-15　2025/04/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/adbbca 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract The streaming instability is a promising mechanism for planetesimal formation. The instability can rapidly form dense clumps that collapse self-gravitationally, which is efficient for large dust grains with Stokes number of the order of 0.1. However, dust growth models predict that collisional fragmentation prevents dust grains from growing to such sizes. We perform local simulations of the streaming instability and measure characteristic collision velocities and collision rates of dust grains based on their trajectories in moderate clumping. The collision velocities are of the order of 0.1% of the sound speed or lower, implying that dust grains can overcome the fragmentation barrier via clumping. We also find that the collision rates are appreciably high regardless of the low collision velocities. Corresponding timescales are of the order of 10 Keplerian periods or shorter, suggesting that dust grains can overcome the drift barrier as well. This streaming-instability-assisted coagulation greatly relaxes the conditions for planetesimal formation as recently implied.
The Bulk Densities of Small Solar System Bodies as a Probe of Planetesimal Formation Peer-reviewed

Misako Tatsuuma, Akimasa Kataoka, Hidekazu Tanaka, Tristan Guillot

The Astrophysical Journal　974　(1)　9-9　2024/10/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ad6a5d 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract Constraining the formation processes of small solar system bodies is crucial for gaining insights into planetesimal formation. Their bulk densities, determined by their compressive strengths, offer valuable information about their formation history. In this paper, we utilize a formulation of the compressive strength of dust aggregates obtained from dust N-body simulations to establish the relation between the bulk density and diameter. We find that this relation can be effectively approximated by a polytrope with an index of 0.5, coupled with a formulation of the compressive strength of dust aggregates. The lowest-density trans-Neptunian objects (TNOs) and main-belt asteroids (MBAs) are well reproduced by dust aggregates composed of 0.1 μm sized grains. However, most TNOs, MBAs, comets, and near-Earth asteroids (NEAs) exhibit higher densities, suggesting the influence of compaction mechanisms such as collision, dust grain disruption, sintering, or melting, leading to further growth. We speculate that there are two potential formation paths for small solar system bodies. One involves the direct coagulation of primordial dust grains, resulting in the formation of first-generation planetesimals, including the lowest-density TNOs, MBAs, and the parent bodies of comets and NEAs. In this case, comets and NEAs are fragments or rubble piles of first-generation planetesimals, and the objects themselves or the rubble are composed of 0.1 μm sized grains. The other path involves the further potential fragmentation of first-generation planetesimals into the compact dust aggregates observed in protoplanetary disks, resulting in the formation of second-generation planetesimals composed of compact dust aggregates, which may contribute to explaining another formation process of comets and NEAs.
A closer look at individual collisions of dust aggregates: material mixing and exchange on microscopic scales Peer-reviewed

Sebastiaan Krijt, Sota Arakawa, Mark Oosterloo, Hidekazu Tanaka

Monthly Notices of the Royal Astronomical Society　534　(3)　2125-2133　2024/09/28

DOI： 10.1093/mnras/stae2247 　

ISSN： 0035-8711

eISSN： 1365-2966
On the elastoplastic behavior in collisional compression of spherical dust aggregates Peer-reviewed

Sota Arakawa, Hidekazu Tanaka, Eiichiro Kokubo, Satoshi Okuzumi, Misako Tatsuuma, Daisuke Nishiura, Mikito Furuichi

Granular Matter　26　(4)　2024/09/11
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10035-024-01463-x 　

ISSN： 1434-5021

eISSN： 1434-7636
Molecular dynamics simulations of head-on low-velocity collisions between particles Peer-reviewed

Yuki Yoshida, Eiichiro Kokubo, Hidekazu Tanaka

Physical Review E　2024/07/19

DOI： 10.1103/PhysRevE.110.015001 　
Three-dimensional Interaction between a Planet and an Isothermal Gaseous Disk. III. Locally Isothermal Cases Peer-reviewed

Hidekazu Tanaka, Kohei Okada

The Astrophysical Journal　2024/06/01

DOI： 10.3847/1538-4357/ad410d 　
Interparticle normal force in highly porous granular matter during compression Peer-reviewed

Sota Arakawa, Misako Tatsuuma, Hidekazu Tanaka, Mikito Furuichi, Daisuke Nishiura

Physical Review E　2024/02/27

DOI： 10.1103/PhysRevE.109.024904 　
Rapid Dust Growth during Hydrodynamic Clumping due to Streaming Instability Peer-reviewed

Ryosuke T. Tominaga, Hidekazu Tanaka

The Astrophysical Journal　2023/12/01

DOI： 10.3847/1538-4357/ad002e 　
Oxygen isotope exchange between molten silicate spherules and ambient water vapor with nonzero relative velocity: Implication for chondrule formation environment Peer-reviewed

Sota Arakawa, Daiki Yamamoto, Takayuki Ushikubo, Hiroaki Kaneko, Hidekazu Tanaka, Shigenobu Hirose, Taishi Nakamoto

ICARUS　405　2023/11

DOI： 10.1016/j.icarus.2023.115690 　

ISSN： 0019-1035

eISSN： 1090-2643
Rapid Formation of Gas-giant Planets via Collisional Coagulation from Dust Grains to Planetary Cores. II. Dependence on Pebble Bulk Density and Disk Temperature Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka

The Astrophysical Journal　954　(2)　2023/09/01

DOI： 10.3847/1538-4357/ace96b 　

ISSN： 0004-637X

eISSN： 1538-4357
Dust Enrichment and Grain Growth in a Smooth Disk around the DG Tau Protostar Revealed by ALMA Triple Bands Frequency Observations Peer-reviewed

Satoshi Ohashi, Munetake Momose, Akimasa Kataoka, Aya E Higuchi, Takashi Tsukagoshi, Takahiro Ueda, Claudio Codella, Linda Podio, Tomoyuki Hanawa, Nami Sakai, Hiroshi Kobayashi, Satoshi Okuzumi, Hidekazu Tanaka

The Astrophysical Journal　954　(2)　110-110　2023/08/28
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ace9b9 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract Characterizing the physical properties of dust grains in a protoplanetary disk is critical to comprehending the planet formation process. Our study presents Atacama Large Millimeter/submillimeter Array (ALMA) high-resolution observations of the young protoplanetary disk around DG Tau at a 1.3 mm dust continuum. The observations, with a spatial resolution of ≈0.″04, or ≈5 au, revealed a geometrically thin and smooth disk without substantial substructures, suggesting that the disk retains the initial conditions of the planet formation. To further analyze the distributions of dust surface density, temperature, and grain size, we conducted a multiband analysis with several dust models, incorporating ALMA archival data of the 0.87 and 3.1 mm dust polarization. The results showed that the Toomre Q parameter is ≲2 at a 20 au radius, assuming a dust-to-gas mass ratio of 0.01. This implies that a higher dust-to-gas mass ratio is necessary to stabilize the disk. The grain sizes depend on the dust models, and for the DSHARP compact dust, they were found to be smaller than ∼400 μm in the inner region (r ≲ 20 au) while exceeding larger than 3 mm in the outer part. Radiative transfer calculations show that the dust scale height is lower than at least one-third of the gas scale height. These distributions of dust enrichment, grain sizes, and weak turbulence strength may have significant implications for the formation of planetesimals through mechanisms such as streaming instability. We also discuss the CO snowline effect and collisional fragmentation in dust coagulation for the origin of the dust size distribution.
Formulating Compressive Strength of Dust Aggregates from Low to High Volume Filling Factors with Numerical Simulations Peer-reviewed

Misako Tatsuuma, Akimasa Kataoka, Satoshi Okuzumi, Hidekazu Tanaka

The Astrophysical Journal　953　(1)　2023/08/01

DOI： 10.3847/1538-4357/acdf43 　

ISSN： 0004-637X

eISSN： 1538-4357
Planet-Disk Interactions and Orbital Evolution Peer-reviewed

Paardekooper, S, Dong, R, Duffell, P, Fung, J, Masset, F. S, Ogilvie, G, Tanaka, H

Protostars and Planets VII, ASP Conference Series　534　685-715　2023/07
Size Dependence of the Bouncing Barrier in Protoplanetary Dust Growth Peer-reviewed

Sota Arakawa, Satoshi Okuzumi, Misako Tatsuuma, Hidekazu Tanaka, Eiichiro Kokubo, Daisuke Nishiura, Mikito Furuichi, Taishi Nakamoto

The Astrophysical Journal Letters　951　(1)　L16-L16　2023/07/01
Publisher: American Astronomical Society
DOI： 10.3847/2041-8213/acdb5f 　

ISSN： 2041-8205

eISSN： 2041-8213

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Abstract Understanding the collisional behavior of dust aggregates is essential in the context of planet formation. It is known that low-velocity collisions of dust aggregates result in bouncing rather than sticking when the filling factor of colliding dust aggregates is higher than a threshold value. However, a large discrepancy between numerical and experimental results on the threshold filling factor was reported so far. In this study, we perform numerical simulations using soft-sphere discrete element methods and demonstrate that the sticking probability decreases with increasing aggregate radius. Our results suggest that the large discrepancy in the threshold filling factor may reflect the difference in the size of dust aggregates in earlier numerical simulations and laboratory experiments.
Compression of Dust Aggregates via Sequential Collisions with High Mass Ratios Peer-reviewed

Hidekazu Tanaka, Ryoichi Anayama, Ryo Tazaki

The Astrophysical Journal　945　(1)　2023/03/01

DOI： 10.3847/1538-4357/acb92b 　

ISSN： 0004-637X

eISSN： 1538-4357
Threshold velocity for the collisional growth of porous dust aggregates consisting of cohesive frictionless spheres Peer-reviewed

Sota Arakawa, Hidekazu Tanaka, Eiichiro Kokubo, Daisuke Nishiura, Mikito Furuichi

Astronomy & Astrophysics　670　L21-L21　2023/02/22
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/202345887 　

ISSN： 0004-6361

eISSN： 1432-0746

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Understanding the collisional outcomes of dust aggregates and their dependence on the material properties of the constituting particles is of great importance for understanding planet formation. Recent numerical simulations have revealed that interparticle tangential friction plays a crucial role in energy dissipation during collisions between porous dust aggregates, but the importance of friction for the collisional growth of dust aggregates remains poorly understood. Here we demonstrate the effects of interparticle tangential friction on the collisional growth of dust aggregates. We performed numerical simulations of collisions between equal-mass porous dust aggregates consisting of cohesive and frictionless spheres. We changed the collision velocity and impact angle systematically and calculated the collisional growth efficiency as a function of the collision velocity. We found that the threshold velocity for collisional growth decreases when dust aggregates are made of frictionless spheres compared to frictional spheres. Our results highlight the importance of tangential interactions for the collisional behavior of dust aggregates and indicate that the predictive equation for the threshold velocity should be reconstructed.
Collisional Growth and Fragmentation of Dust Aggregates. II. Mass Distribution of Icy Fragments Peer-reviewed

Yukihiko Hasegawa, Takeru K. Suzuki, Hidekazu Tanaka, Hiroshi Kobayashi, Koji Wada

The Astrophysical Journal　944　(1)　2023/02/01

DOI： 10.3847/1538-4357/acadda 　

ISSN： 0004-637X

eISSN： 1538-4357
Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. II. Dust-ring Formation Mediated by Backreaction and Fragmentation Peer-reviewed

Ryosuke T. Tominaga, Hidekazu Tanaka, Hiroshi Kobayashi, Shu-ichiro Inutsuka

The Astrophysical Journal　2022/12/01

DOI： 10.3847/1538-4357/ac97e8 　
Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction Peer-reviewed

Sota Arakawa, Hidekazu Tanaka, Eiichiro Kokubo

The Astrophysical Journal　939　(2)　100-100　2022/11/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac96e1 　

ISSN： 0004-637X 1538-4357

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<jats:title>Abstract</jats:title> <jats:p>The pairwise collisional growth of dust aggregates consisting of submicron-sized grains is the first step of planet formation, and understanding the collisional behavior of dust aggregates is therefore essential. It is known that the main energy dissipation mechanisms are the tangential frictions between particles in contact, namely, rolling, sliding, and twisting. However, there is great uncertainty for the strength of rolling friction, and the dependence of the collisional growth condition on the strength of rolling friction was poorly understood. Here we performed numerical simulations of collisions between two equal-mass porous aggregates with various collision velocities and impact parameters, and we also changed the strength of rolling friction systematically. We found that the threshold of the collision velocity for the fragmentation of dust aggregates is nearly independent of the strength of rolling friction. This is because the total amount of the energy dissipation by the tangential frictions is nearly constant even though the strength of rolling friction is varied.</jats:p>
Impacts of Viscous Dissipation on Collisional Growth and Fragmentation of Dust Aggregates Peer-reviewed

Sota Arakawa, Hidekazu Tanaka, Eiichiro Kokubo

The Astrophysical Journal　933　(2)　2022/07/01

DOI： 10.3847/1538-4357/ac7460 　

ISSN： 0004-637X

eISSN： 1538-4357
Can Stellar-mass Black Hole Growth Disrupt Disks of Active Galactic Nuclei? The Role of Mechanical Feedback Peer-reviewed

Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman, Rosalba Perna, Hidekazu Tanaka, Imre Bartos

The Astrophysical Journal　927　(1)　2022/03/01

DOI： 10.3847/1538-4357/ac45f8 　

ISSN： 0004-637X

eISSN： 1538-4357
Eccentric Gap Induced by a Super-Jupiter-mass Planet Peer-reviewed

Yuki A. Tanaka, Kazuhiro D. Kanagawa, Hidekazu Tanaka, Takayuki Tanigawa

The Astrophysical Journal　925　(1)　95-95　2022/01/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac3af5 　

ISSN： 0004-637X

eISSN： 1538-4357

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<title>Abstract</title> A giant planet embedded in a protoplanetary disk opens a gap by tidal interaction, and properties of the gap strongly depend on the planetary mass and disk parameters. Many numerical simulations of this process have been conducted, but detailed simulations and analysis of gap formation by a super-Jupiter-mass planet have not been thoroughly conducted. We performed two-dimensional numerical hydrodynamic simulations of the gap formation process by a super-Jupiter-mass planet and examined the eccentricity of the gap. When the planet is massive, the radial motion of gas is excited, causing the eccentricity of the gap’s outer edge to increase. Our simulations showed that the critical planetary mass for the eccentric gap was ∼ 3 <italic>M</italic> _J in a disk with <italic>α</italic> = 4.0 × 10⁻³ and <italic>h</italic>/<italic>r</italic> = 0.05, a finding that was consistent with that reported in a previous work. The critical planetary mass for the eccentric gap depends on the viscosity and the disk scale height. We found that the critical mass could be described by considering a dimensionless parameter related to the gap depth. The onset of gap eccentricity enhanced the surface density inside the gap, shallowing the gap more than the empirical relation derived in previous studies for a planet heavier than the critical mass. Therefore, our results suggest that the mass accretion rate, which strongly depends on the gas surface density in the gap, is also enhanced for super-Jupiter-mass planets. These results may substantially impact the formation and evolution processes of super-Jupiter-mass planets and population synthesis calculations.
Rapid Formation of Gas-giant Planets via Collisional Coagulation from Dust Grains to Planetary Cores Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka

The Astrophysical Journal　922　(1)　2021/11/01

DOI： 10.3847/1538-4357/ac289c 　

ISSN： 0004-637X

eISSN： 1538-4357
Dust Rings as a Footprint of Planet Formation in a Protoplanetary Disk Peer-reviewed

Kazuhiro D. Kanagawa, Takayuki Muto, Hidekazu Tanaka

The Astrophysical Journal　921　(2)　2021/11/01

DOI： 10.3847/1538-4357/ac282b 　

ISSN： 0004-637X

eISSN： 1538-4357
Collisional Growth and Fragmentation of Dust Aggregates with Low Mass Ratios. I. Critical Collision Velocity for Water Ice Peer-reviewed

Yukihiko Hasegawa, Takeru K. Suzuki, Hidekazu Tanaka, Hiroshi Kobayashi, Koji Wada

The Astrophysical Journal　915　(1)　22-22　2021/07/01

DOI： 10.3847/1538-4357/abf6cf 　

ISSN： 0004-637X

eISSN： 1538-4357
Ring Formation by Coagulation of Dust Aggregates in the Early Phase of Disk Evolution around a Protostar Peer-reviewed

Satoshi Ohashi, Hiroshi Kobayashi, Riouhei Nakatani, Satoshi Okuzumi, Hidekazu Tanaka, Koji Murakawa, Yichen Zhang, Hauyu Baobab Liu, Nami Sakai

The Astrophysical Journal　907　(2)　80-80　2021/02/01

DOI： 10.3847/1538-4357/abd0fa 　

ISSN： 0004-637X

eISSN： 1538-4357
Comments on 'Type II migration strikes back - an old paradigm for planet migration in discs' by Scardoni et al. Peer-reviewed

Kazuhiro D. Kanagawa, Hidekazu Tanaka

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　494　(3)　3449-3452　2020/05

DOI： 10.1093/mnras/staa1011 　

ISSN： 0035-8711

eISSN： 1365-2966
Final Masses of Giant Planets. III. Effect of Photoevaporation and a New Planetary Migration Model Peer-reviewed

Hidekazu Tanaka, Kiyoka Murase, Takayuki Tanigawa

The Astrophysical Journal　891　(2)　id. 143　2020/03/10

DOI： 10.3847/1538-4357/ab77af 　
Unveiling Dust Aggregate Structure in Protoplanetary Disks by Millimeter-wave Scattering Polarization Peer-reviewed

Ryo Tazaki, Hidekazu Tanaka, Akimasa Kataoka, Satoshi Okuzumi, Takayuki Muto

The Astrophysical Journal　885　(1)　52-52　2019/10/30

DOI： 10.3847/1538-4357/ab45f0 　

ISSN： 0004-637X

eISSN： 1538-4357
Effect of dust size and structure on scattered-light images of protoplanetary discs Peer-reviewed

Tazaki Ryo, Tanaka H, Muto T, Kataoka A, Okuzumi S

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　485　(4)　4951-4966　2019/06

DOI： 10.1093/mnras/stz662 　

ISSN： 0035-8711
Tensile Strength of Porous Dust Aggregates Peer-reviewed

Tatsuuma Misako, Kataoka Akimasa, Tanaka Hidekazu

ASTROPHYSICAL JOURNAL　874　(2)　2019/04/01

DOI： 10.3847/1538-4357/ab09f7 　

ISSN： 0004-637X
Shock-generating Planetesimals Perturbed by a Giant Planet in a Gas Disk Peer-reviewed

Nagasawa M, Tanaka K. K, Tanaka H, Nomura H, Nakamoto T, Miura H

ASTROPHYSICAL JOURNAL　871　(1)　110-110　2019/01/20

DOI： 10.3847/1538-4357/aaf795 　

ISSN： 0004-637X

eISSN： 1538-4357
Collisional disruption of planetesimals in the gravity regime with iSALE code: Comparison with SPH code for purely hydrodynamic bodies Peer-reviewed

Ryo Suetsugu, Hidekazu Tanaka, Hiroshi Kobayashi, Hidenori Genda

Icarus　314　121-132　2018/11/01
Publisher: Academic Press Inc.
DOI： 10.1016/j.icarus.2018.05.027 　

ISSN： 1090-2643 0019-1035
Slowing Down Type II Migration of Gas Giants to Match Observational Data Peer-reviewed

Ida, Shigeru, Tanaka, Hidekazu, Johansen, Anders, Kanagawa, Kazuhiro D, Tanigawa, Takayuki

The Astrophysical Journal　864　(1)　77(10pp)-77　2018/09
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/aad69c 　

eISSN： 1538-4357
ALMA observations of sulfur-bearing molecules in protoplanetary disks

H. Nomura, A. Higuchi, N. Sakai, S. Yamamoto, M. Nagasawa, K.K. Tanaka, H. Miura, T. Nakamoto, H. Tanaka, T. Yamamoto, C. Walsh, T.J. Millar

Proceedings of the International Astronomical Union　14　(S345)　360-361　2018/08
Publisher: Cambridge University Press (CUP)
DOI： 10.1017/s1743921319002072 　

ISSN： 1743-9213

eISSN： 1743-9221

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Abstract It is thought that protoplanets formed in protoplanetary disks excite the orbital motion of the surrounding planetesimals, and the bow shocks caused by the highly excited planetesimals heat their icy component evaporating into gas. We have performed model calculations to study the evolution of molecular abundances of the evaporated icy component, which suggests sulfur-bearing molecules can be good tracers of icy planetesimal evaporation. Here we report the result of our ALMA observations of sulfur-bearing molecules towards protoplanetary disks. The lines were undetected but the obtained upper limits of the line fluxes and our model calculations give upper limits of the fractional abundances of x(H₂S) < 10⁻¹¹ and x(SO) < 10⁻¹⁰ in the outer disk. These results are consistent with the molecular abundances in comets in our Solar system.
From Planetesimal to Planet in Turbulent Disks. II. Formation of Gas Giant Planets Peer-reviewed

Kobayashi Hiroshi, Tanaka Hidekazu

ASTROPHYSICAL JOURNAL　862　(2)　2018/08/01

DOI： 10.3847/1538-4357/aacdf5 　

ISSN： 0004-637X
Radial Migration of Gap-opening Planets in Protoplanetary Disks. I. The Case of a Single Planet Peer-reviewed

Kanagawa Kazuhiro D, Tanaka Hidekazu, Szuszkiewicz Ewa

ASTROPHYSICAL JOURNAL　861　(2)　140-140　2018/07/10

DOI： 10.3847/1538-4357/aac8d9 　

ISSN： 0004-637X

eISSN： 1538-4357
Light Scattering by Fractal Dust Aggregates. II. Opacity and Asymmetry Parameter Peer-reviewed

Tazaki Ryo, Tanaka Hidekazu

ASTROPHYSICAL JOURNAL　860　(1)　2018/06/10

DOI： 10.3847/1538-4357/aac32d 　

ISSN： 0004-637X
Modelling of deep gaps created by giant planets in protoplanetary disks Peer-reviewed

Kanagawa Kazuhiro D, Tanaka Hidekazu, Muto Takayuki, Tanigawa Takayuki

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　69　(6)　2017/12

DOI： 10.1093/pasj/psx114 　

ISSN： 0004-6264

eISSN： 2053-051X
Thermal conductivity of porous aggregates Peer-reviewed

Sota Arakawa, Hidekazu Tanaka, Akimasa Kataoka, Taishi Nakamoto

ASTRONOMY & ASTROPHYSICS　608　L7(4pp)　2017/12

DOI： 10.1051/0004-6361/201732182 　

ISSN： 1432-0746
Impact erosion model for gravity-dominated planetesimals Peer-reviewed

Hidenori Genda, Tomoaki Fujita, Hiroshi Kobayashi, Hidekazu Tanaka, Ryo Suetsugu, Yutaka Abe

ICARUS　294　234-246　2017/09

DOI： 10.1016/j.icarus.2017.03.009 　

ISSN： 0019-1035

eISSN： 1090-2643
Analyzing multistep homogeneous nucleation in vapor-to-solid transitions using molecular dynamics simulations Peer-reviewed

Kyoko K. Tanaka, Jurg Diemand, Hidekazu Tanaka, Raymond Angelil

PHYSICAL REVIEW E　96　(2)　022804(9pp)　2017/08

DOI： 10.1103/PhysRevE.96.022804 　

ISSN： 2470-0045

eISSN： 2470-0053
Comprehensive Study of Thermal Desorption of Grain-surface Species by Accretion Shocks around Protostars Peer-reviewed

Hitoshi Miura, Tetsuo Yamamoto, Hideko Nomura, Taishi Nakamoto, Kyoko K. Tanaka, Hidekazu Tanaka, Makiko Nagasawa

ASTROPHYSICAL JOURNAL　839　(1)　47(16pp)　2017/04

DOI： 10.3847/1538-4357/aa67df 　

ISSN： 0004-637X

eISSN： 1538-4357
Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation Peer-reviewed

L. Piani, S. Tachibana, T. Hama, H. Tanaka, Y. Endo, I. Sugawara, L. Dessimoulie, Y. Kimura, A. Miyake, J. Matsuno, A. Tsuchiyama, K. Fujita, S. Nakatsubo, H. Fukushi, S. Mori, T. Chigai, H. Yurimoto, A. Kouchi

ASTROPHYSICAL JOURNAL　837　(1)　35(11pp)　2017/03

DOI： 10.3847/1538-4357/aa5ca6 　

ISSN： 0004-637X

eISSN： 1538-4357
Testing planetesimal formation theory via observations

Tazaki Ryo, Tanaka Hidekazu, Okuzumi Satoshi, Kataoka Akimasa, Nomura Hideko

Planetary People - The Japanese Society for Planetary Sciences　26　(2)　46-55　2017
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.26.2_46 　

ISSN： 0918-273X
Mass constraint for a planet in a protoplanetary disk from the gap width Peer-reviewed

Kazuhiro D. Kanagawa, Takayuki Muto, Hidekazu Tanaka, Takayuki Tanigawa, Taku Takeuchi, Takashi Tsukagoshi, Munetake Momose

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　68　(3)　43(7pp)　2016/06

DOI： 10.1093/pasj/psw037 　

ISSN： 0004-6264

eISSN： 2053-051X
LIGHT SCATTERING BY FRACTAL DUST AGGREGATES. I. ANGULAR DEPENDENCE OF SCATTERING Peer-reviewed

Ryo Tazaki, Hidekazu Tanaka, Satoshi Okuzumi, Akimasa Kataoka, Hideko Nomura

ASTROPHYSICAL JOURNAL　823　(2)　70(16pp)　2016/06

DOI： 10.3847/0004-637X/823/2/70 　

ISSN： 0004-637X

eISSN： 1538-4357
FINAL MASSES OF GIANT PLANETS. II. JUPITER FORMATION IN A GAS-DEPLETED DISK Peer-reviewed

Takayuki Tanigawa, Hidekazu Tanaka

ASTROPHYSICAL JOURNAL　823　(1)　48(14pp)　2016/05

DOI： 10.3847/0004-637X/823/1/48 　

ISSN： 0004-637X

eISSN： 1538-4357
SINTERING-INDUCED DUST RING FORMATION IN PROTOPLANETARY DISKS: APPLICATION TO THE HL TAU DISK Peer-reviewed

Satoshi Okuzumi, Munetake Momose, Sin-iti Sirono, Hiroshi Kobayashi, Hidekazu Tanaka

ASTROPHYSICAL JOURNAL　821　(2)　82(24pp)　2016/04

DOI： 10.3847/0004-637X/821/2/82 　

ISSN： 0004-637X

eISSN： 1538-4357
FROM PLANETESIMALS TO PLANETS IN TURBULENT PROTOPLANETARY DISKS. I. ONSET OF RUNAWAY GROWTH Peer-reviewed

Kobayashi, Hiroshi Tanaka, Hidekazu Okuzumi, Satoshi

Astrophys. J.　817　(2)　105　2016/02/01

DOI： 10.3847/0004-637X/817/2/105 　
Resolution dependence of disruptive collisions between planetesimals in the gravity regime Peer-reviewed

Hidenori Genda, Tomoaki Fujita, Hiroshi Kobayashi, Hidekazu Tanaka, Yutaka Abe

ICARUS　262　58-66　2015/12

DOI： 10.1016/j.icarus.2015.08.029 　

ISSN： 0019-1035

eISSN： 1090-2643
Detailed structure of the outer disk around HD169142 with polarized light in H-band Peer-reviewed

Munetake Momose, Ayaka Morita, Misato Fukagawa, Takayuki Muto, Taku Takeuchi, Jun Hashimoto, Mitsuhiko Honda, Tomoyuki Kudo, Yoshiko K. Okamoto, Kazuhiro D. Kanagawa, Hidekazu Tanaka, Carol A. Grady, Michael L. Sitko, Eiji Akiyama, Thayne Currie, Katherine B. Follette, Satoshi Mayama, Nobuhiko Kusakabe, Lyu Abe, Wolfgang Brandner, Timothy D. Brandt, Joseph C. Carson, Sebastian Egner, Markus Feldt, Miwa Goto, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishii, Masanori Iye, Markus Janson, Ryo Kandori, Gillian R. Knapp, Masayuki Kuzuhara, Jungmi Kwon, Taro Matsuo, Michael W. McElwain, Shoken Miyama, Jun-Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae-Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Yasuhiro H. Takahashi, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, John Wisniewski, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　67　(5)　83　2015/10

DOI： 10.1093/pasj/psv051 　

ISSN： 0004-6264

eISSN： 2053-051X
Homogeneous SPC/E water nucleation in large molecular dynamics simulations Peer-reviewed

Raymond Angelil, Juerg Diemand, Kyoko K. Tanaka, Hidekazu Tanaka

JOURNAL OF CHEMICAL PHYSICS　143　(6)　064507　2015/08

DOI： 10.1063/1.4928055 　

ISSN： 0021-9606

eISSN： 1089-7690
Simple improvements to classical bubble nucleation models Peer-reviewed

Kyoko K. Tanaka, Hidekazu Tanaka, Raymond Angelil, Juerg Diemand

PHYSICAL REVIEW E　92　(2)　022401　2015/08

DOI： 10.1103/PhysRevE.92.022401 　

ISSN： 1539-3755

eISSN： 1550-2376
MASS ESTIMATES OF A GIANT PLANET IN A PROTOPLANETARY DISK FROM THE GAP STRUCTURES Peer-reviewed

Kazuhiro D. Kanagawa, Takayuki Muto, Hidekazu Tanaka, Takayuki Tanigawa, Taku Takeuchi, Takashi Tsukagoshi, Munetake Momose

ASTROPHYSICAL JOURNAL LETTERS　806　(1)　L15　2015/06

DOI： 10.1088/2041-8205/806/1/L15 　

ISSN： 2041-8205

eISSN： 2041-8213
Formation of a disc gap induced by a planet: effect of the deviation from Keplerian disc rotation Peer-reviewed

K. D. Kanagawa, H. Tanaka, T. Muto, T. Tanigawa, T. Takeuchi

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　448　(1)　994-1006　2015/03

DOI： 10.1093/mnras/stv025 　

ISSN： 0035-8711

eISSN： 1365-2966
Bubble evolution and properties in homogeneous nucleation simulations Peer-reviewed

Raymond Angelil, Juerg Diemand, Kyoko K. Tanaka, Hidekazu Tanaka

PHYSICAL REVIEW E　90　(6)　063301　2014/12

DOI： 10.1103/PhysRevE.90.063301 　

ISSN： 1539-3755

eISSN： 1550-2376
The Multifaceted Planetesimal Formation Process Peer-reviewed

Anders Johansen, Jürgen Blum, Hidekazu Tanaka, Chris Ormel, Martin Bizzarro, Hans Rickman

Protostars and Planets VI　6　547-570　2014/12
Direct simulations of homogeneous bubble nucleation: Agreement with classical nucleation theory and no local hot spots Peer-reviewed

Juerg Diemand, Raymond Angelil, Kyoko K. Tanaka, Hidekazu Tanaka

PHYSICAL REVIEW E　90　(5)　052407　2014/11

DOI： 10.1103/PhysRevE.90.052407 　

ISSN： 1539-3755

eISSN： 1550-2376
REVISITING JOVIAN-RESONANCE INDUCED CHONDRULE FORMATION Peer-reviewed

M. Nagasawa, K. K. Tanaka, H. Tanaka, T. Nakamoto, H. Miura, T. Yamamoto

ASTROPHYSICAL JOURNAL LETTERS　794　(1)　L7(5pp)　2014/10

DOI： 10.1088/2041-8205/794/1/L7 　

ISSN： 2041-8205

eISSN： 2041-8213
Opacity of fluffy dust aggregates Peer-reviewed

Akimasa Kataoka, Satoshi Okuzumi, Hidekazu Tanaka, Hideko Nomura

ASTRONOMY & ASTROPHYSICS　568　A42(15pp)　2014/08

DOI： 10.1051/0004-6361/201323199 　

ISSN： 0004-6361

eISSN： 1432-0746
Free energy of cluster formation and a new scaling relation for the nucleation rate Peer-reviewed

Kyoko K. Tanaka, Juerg Diemand, Raymond Angelil, Hidekazu Tanaka

JOURNAL OF CHEMICAL PHYSICS　140　(19)　194310(7pp)　2014/05

DOI： 10.1063/1.4875803 　

ISSN： 0021-9606

eISSN： 1089-7690
Molecular dynamics simulations of the nucleation of water: Determining the sticking probability and formation energy of a cluster Peer-reviewed

Kyoko K. Tanaka, Akio Kawano, Hidekazu Tanaka

JOURNAL OF CHEMICAL PHYSICS　140　(11)　114302(11pp)　2014/03

DOI： 10.1063/1.4867909 　

ISSN： 0021-9606

eISSN： 1089-7690
Properties of liquid clusters in large-scale molecular dynamics nucleation simulations Peer-reviewed

Raymond Angelil, Juerg Diemand, Kyoko K. Tanaka, Hidekazu Tanaka

JOURNAL OF CHEMICAL PHYSICS　140　(7)　074303(16pp)　2014/02

DOI： 10.1063/1.4865256 　

ISSN： 0021-9606

eISSN： 1089-7690
Growth efficiency of dust aggregates through collisions with high mass ratios Peer-reviewed

Koji Wada, Hidekazu Tanaka, Satoshi Okuzumi, Hiroshi Kobayashi, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

ASTRONOMY & ASTROPHYSICS　559　A62(8pp)　2013/11

DOI： 10.1051/0004-6361/201322259 　

ISSN： 0004-6361

eISSN： 1432-0746
Large scale molecular dynamics simulations of homogeneous nucleation Peer-reviewed

Juerg Diemand, Raymond Angelil, Kyoko K. Tanaka, Hidekazu Tanaka

JOURNAL OF CHEMICAL PHYSICS　139　(7)　074309(14pp)　2013/08

DOI： 10.1063/1.4818639 　

ISSN： 0021-9606
Evaporation of icy planetesimals due to bow shocks Peer-reviewed

Kyoko K. Tanaka, Tetsuo Yamamoto, Hidekazu Tanaka, Hitoshi Miura, Makiko Nagasawa, Taishi Nakamoto

Astrophysical Journal　764　(2)　120(11pp)　2013/02/20
Publisher: Institute of Physics Publishing
DOI： 10.1088/0004-637X/764/2/120 　

ISSN： 1538-4357 0004-637X

eISSN： 1538-4357
Large Scale MD Simulations of Nucleation Peer-reviewed

Juerg Diemand, Raymond Angelil, Kyoko K. Tanaka, Hidekazu Tanaka

NUCLEATION AND ATMOSPHERIC AEROSOLS　1527　19-22　2013

DOI： 10.1063/1.4803194 　

ISSN： 0094-243X
Fluffy dust forms icy planetesimals by static compression Peer-reviewed

Akimasa Kataoka, Hidekazu Tanaka, Satoshi Okuzumi, Koji Wada

Astronomy and Astrophysics　557　L4(4pp)　2013

DOI： 10.1051/0004-6361/201322151 　

ISSN： 0004-6361 1432-0746
Static compression of porous dust aggregates Peer-reviewed

A. Kataoka, H. Tanaka, S. Okuzumi, K. Wada

Astronomy and Astrophysics　554　A4(12pp)　2013

DOI： 10.1051/0004-6361/201321325 　

ISSN： 0004-6361 1432-0746
Migration rates of planets due to scattering of planetesimals Peer-reviewed

C. W. Ormel, S. Ida, H. Tanaka

Astrophysical Journal　758　(2)　80　2012/10/20
Publisher: Institute of Physics Publishing
DOI： 10.1088/0004-637X/758/2/80 　

ISSN： 1538-4357 0004-637X
MIGRATION RATES OF PLANETS DUE TO SCATTERING OF PLANETESIMALS Peer-reviewed

C. W. Ormel, S. Ida, H. Tanaka

ASTROPHYSICAL JOURNAL　758　(2)　80(17pp)　2012/10

DOI： 10.1088/0004-637X/758/2/80 　

ISSN： 0004-637X
GEOMETRIC CROSS SECTIONS OF DUST AGGREGATES AND A COMPRESSION MODEL FOR AGGREGATE COLLISIONS Peer-reviewed

Toru Suyama, Koji Wada, Hidekazu Tanaka, Satoshi Okuzumi

ASTROPHYSICAL JOURNAL　753　(2)　115(10pp)　2012/07

DOI： 10.1088/0004-637X/753/2/115 　

ISSN： 0004-637X
GEOMETRIC CROSS SECTIONS OF DUST AGGREGATES AND A COMPRESSION MODEL FOR AGGREGATE COLLISIONS Peer-reviewed

Toru Suyama, Koji Wada, Hidekazu Tanaka, Satoshi Okuzumi

ASTROPHYSICAL JOURNAL　753　(2)　115　2012/07

DOI： 10.1088/0004-637X/753/2/115 　

ISSN： 0004-637X
Rapid coagulation of porous dust aggregates outside the snow line: A pathway to successful icy planetesimal formation Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Hiroshi Kobayashi, Koji Wada

Astrophysical Journal　752　(2)　106　2012/06/20
Publisher: Institute of Physics Publishing
DOI： 10.1088/0004-637X/752/2/106 　

ISSN： 1538-4357 0004-637X
RAPID COAGULATION OF POROUS DUST AGGREGATES OUTSIDE THE SNOW LINE: A PATHWAY TO SUCCESSFUL ICY PLANETESIMAL FORMATION Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Hiroshi Kobayashi, Koji Wada

ASTROPHYSICAL JOURNAL　752　(2)　106(18pp)　2012/06

DOI： 10.1088/0004-637X/752/2/106 　

ISSN： 0004-637X
Growth of Cosmic Dust Aggregates and Reexamination of Particle Interaction Models Peer-reviewed

Hidekazu Tanaka, Koji Wada, Toru Suyama, Satoshi Okuzumi

PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT　195　(195)　101-113　2012

DOI： 10.1143/PTPS.195.101 　

ISSN： 0375-9687
PLANETARY CORE FORMATION WITH COLLISIONAL FRAGMENTATION AND ATMOSPHERE TO FORM GAS GIANT PLANETS Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka, Alexander V. Krivov

ASTROPHYSICAL JOURNAL　738　(1)　35(11pp)　2011/09

DOI： 10.1088/0004-637X/738/1/35 　

ISSN： 0004-637X
Planetary core formation with collisional fragmentation and atmosphere to form gas giant planets Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka, Alexander V. Krivov

Astrophysical Journal　738　(1)　35　2011/09/01
Publisher: Institute of Physics Publishing
DOI： 10.1088/0004-637X/738/1/35 　

ISSN： 1538-4357 0004-637X
The rebound condition of dust aggregates revealed by numerical simulation of their collisions Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

Astrophysical Journal　737　(1)　36　2011/08/10
Publisher: Institute of Physics Publishing
DOI： 10.1088/0004-637X/737/1/36 　

ISSN： 1538-4357 0004-637X
THE REBOUND CONDITION OF DUST AGGREGATES REVEALED BY NUMERICAL SIMULATION OF THEIR COLLISIONS Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

ASTROPHYSICAL JOURNAL　737　(1)　36(12pp)　2011/08

DOI： 10.1088/0004-637X/737/1/36 　

ISSN： 0004-637X
Molecular dynamics simulations of nucleation from vapor to solid composed of Lennard-Jones molecules Peer-reviewed

Kyoko K. Tanaka, Hidekazu Tanaka, Tetsuo Yamamoto, Katsuyuki Kawamura

JOURNAL OF CHEMICAL PHYSICS　134　(20)　204313(13pp)　2011/05

DOI： 10.1063/1.3593459 　

ISSN： 0021-9606
ELECTROSTATIC BARRIER AGAINST DUST GROWTH IN PROTOPLANETARY DISKS. II. MEASURING THE SIZE OF THE "FROZEN" ZONE Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Taku Takeuchi, Masa-aki Sakagami

ASTROPHYSICAL JOURNAL　731　(2)　96(16pp)　2011/04

DOI： 10.1088/0004-637X/731/2/96 　

ISSN： 0004-637X
ELECTROSTATIC BARRIER AGAINST DUST GROWTH IN PROTOPLANETARY DISKS. I. CLASSIFYING THE EVOLUTION OF SIZE DISTRIBUTION Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Taku Takeuchi, Masa-aki Sakagami

ASTROPHYSICAL JOURNAL　731　(2)　95(20pp)　2011/04

DOI： 10.1088/0004-637X/731/2/95 　

ISSN： 0004-637X
Molecular Dynamics Simulations of Nucleation from Vapor with Lennard-Jones Type and H2O Molecules Peer-reviewed

Kyoko K. Tanaka, Hidekazu Tanaka, Tetsuo Yamamoto, Katsuyuki Kawamura

Physics and Chemistry of Ice　12　307-312　2011
Planetary growth with collisional fragmentation and gas drag Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka, Alexander V. Krivov, Satoshi Inaba

ICARUS　209　(2)　836-847　2010/10

DOI： 10.1016/j.icarus.2010.04.021 　

ISSN： 0019-1035
Fragmentation model dependence of collision cascades Peer-reviewed

Hiroshi Kobayashi, Hidekazu Tanaka

ICARUS　206　(2)　735-746　2010/04

DOI： 10.1016/j.icarus.2009.10.004 　

ISSN： 0019-1035
NUMERICAL MODELING OF THE COAGULATION AND POROSITY EVOLUTION OF DUST AGGREGATES Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Masa-Aki Sakagami

ASTROPHYSICAL JOURNAL　707　(2)　1247-1263　2009/12

DOI： 10.1088/0004-637X/707/2/1247 　

ISSN： 0004-637X

eISSN： 1538-4357
COLLISIONAL GROWTH CONDITIONS FOR DUST AGGREGATES Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

ASTROPHYSICAL JOURNAL　702　(2)　1490-1501　2009/09

DOI： 10.1088/0004-637X/702/2/1490 　

ISSN： 0004-637X

eISSN： 1538-4357
Dust Growth in Protoplanetary Disks Peer-reviewed

Hidekazu Tanaka, Koji Wada, Toru Suyama

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY　1158　97-+　2009

ISSN： 0094-243X
Numerical Simulation of Dust Aggregate Collisions: Growth and Disruption of Dust Aggregates Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY　1158　103-+　2009

ISSN： 0094-243X
Electric Charging of Dust Aggregates and its Effect on Dust Coagulation in Protoplanetary Disks Peer-reviewed

Satoshi Okuzumi, Hidekazu Tanaka, Masa-aki Sakagami

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY　1158　149-+　2009

ISSN： 0094-243X
Collisional Evolution, Low Temperature Crystallization, and Infrared Spectra of Dust Aggregates in Protoplanetary Disks

YAMAMOTO Tetsuo, WADA Koji, KOBAYASHI Hiroshi, KIMURA Hiroshi, TANAKA Kyoko K, TANAKA Hidekazu

The astronomical herald　102　(2)　118-126　2009
Publisher:
ISSN： 0374-2466
Numerical simulation of density evolution of dust aggregates in protoplanetary disks. I. Head-on collisions Peer-reviewed

Toru Suyama, Koji Wada, Hidekazu Tanaka

ASTROPHYSICAL JOURNAL　684　(2)　1310-1322　2008/09

DOI： 10.1086/590143 　

ISSN： 0004-637X
Numerical Simulation and Formulation of Compression Process During Dust Growth Invited Peer-reviewed

SUYAMA Toru, WADA Koji, TANAKA Hidekazu

Planetary Peaple　17　(3)　177-184　2008/09
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
Numerical simulation of dust aggregate collisions. II. Compression and disruption of three-dimensional aggregates in head-on collisions Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

ASTROPHYSICAL JOURNAL　677　(2)　1296-1308　2008/04

DOI： 10.1086/529511 　

ISSN： 0004-637X
Numerical Simulation of Dust Aggregate Collisions

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

Low Temperature Science　66　55-64　2008
Evolution of Dust Grains in Planet Formation Process

Hidekazu Tanaka

Low Temperature Science　66　47-54　2008
Numerical simulation of dust aggregate collisions. I. Compression and disruption of two-dimensional aggregates Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

Astrophysical Journal　661　(1 I)　320-333　2007/05/20
Publisher: Institute of Physics Publishing
DOI： 10.1086/514332 　

ISSN： 1538-4357 0004-637X
Numerical simulation of dust aggregate collisions. I. Compression and disruption of two-dimensional aggregates Peer-reviewed

Koji Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

ASTROPHYSICAL JOURNAL　661　(1)　320-333　2007/05

DOI： 10.1086/514332 　

ISSN： 0004-637X
Numerical simulation of dust aggregate collisions

Low temperature science　66　55-64　2007
Publisher:
ISSN： 1880-7593
Evolution of dust grains in planet formation process

Low temperature science　66　47-54　2007
Publisher:
ISSN： 1880-7593
Orbital evolution and accretion of protoplanets tidally interacting with a gas disk - II. Solid surface density evolution with type-I migration Peer-reviewed

Junko K. Daisaka, Hidekazu Tanaka, Shigeru Ida

ICARUS　185　(2)　492-507　2006/12

DOI： 10.1016/j.icarus.2006.07.003 　

ISSN： 0019-1035
Orbital evolution and accretion of protoplanets tidally interacting with a gas disk I. Effects of interaction with planetesimals and other protoplanets Peer-reviewed

J Kominami, H Tanaka, S Ida

ICARUS　178　(2)　540-552　2005/11

DOI： 10.1016/j.icarus.2005.05.008 　

ISSN： 0019-1035
Type-I planetary migration and formation of protoplanets

Kominami Junko, Tanaka Hidekazu, Ida Shigeru

Planetary People　14　(3)　134-141　2005/09/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
The evidence of an early stellar encounter in Edgeworth-Kuiper belt Peer-reviewed

H Kobayashi, S Ida, H Tanaka

ICARUS　177　(1)　246-255　2005/09

DOI： 10.1016/j.icarus.2005.02.017 　

ISSN： 0019-1035
Dust growth and settling in protoplanetary disks and disk spectral energy distributions. I. Laminar disks Peer-reviewed

Hidekazu Tanaka, Youhei Himeno, Shigeru Ida

Astrophysical Journal　625　(1 I)　414-426　2005/05/20
Publisher: Institute of Physics Publishing
DOI： 10.1086/429658 　

ISSN： 1538-4357 0004-637X
Tests of the homogeneous nucleation theory with molecular-dynamics simulations. I. Lennard-Jones molecules Peer-reviewed

KK Tanaka, K Kawamura, H Tanaka, K Nakazawa

JOURNAL OF CHEMICAL PHYSICS　122　(18)　184514　2005/05

DOI： 10.1063/1.1896345 　

ISSN： 0021-9606
A new theory of bubble formation in magma Peer-reviewed

K Yamada, H Tanaka, K Nakazawa, H Emori

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　110　(B2)　B02203-(17pp)　2005/02

DOI： 10.1029/2004JB003113 　

ISSN： 2169-9313

eISSN： 2169-9356
Three-dimensional interaction between a planet and an isothermal gaseous disk. II. Eccentricity waves and bending waves Peer-reviewed

H Tanaka, WR Ward

ASTROPHYSICAL JOURNAL　602　(1)　388-395　2004/02

DOI： 10.1086/380992 　

ISSN： 0004-637X
Radial diffusion rate of planetesimals due to gravitational encounters Peer-reviewed

K Ohtsuki, H Tanaka

ICARUS　162　(1)　47-58　2003/03

DOI： 10.1016/S0019-1035(02)00078-7 　

ISSN： 0019-1035
A new formulation of the viscosity in planetary rings Peer-reviewed

H Tanaka, K Ohtsuki, H Daisaka

ICARUS　161　(1)　144-156　2003/01

DOI： 10.1016/S0019-1035(02)00015-5 　

ISSN： 0019-1035
Non-equilibrium condensation in a primordial solar nebula: Formation of refractory metal nuggets Peer-reviewed

KK Tanaka, H Tanaka, K Nakazawa

ICARUS　160　(1)　197-207　2002/11

DOI： 10.1006/icar.2002.6960 　

ISSN： 0019-1035
Excitation of orbital inclinations of asteroids during depletion of a protoplanetary disk: Dependence on the disk configuration Peer-reviewed

M Nagasawa, S Ida, H Tanaka

ICARUS　159　(2)　322-327　2002/10

DOI： 10.1006/icar.2002.6925 　

ISSN： 0019-1035
Orbital stability of a protoplanet system under a drag force proportional to the random velocity

K Iwasaki, H Emori, K Nakazawa, H Tanaka

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　54　(3)　471-479　2002/06

DOI： 10.1093/pasj/54.3.471 　

ISSN： 0004-6264

eISSN： 2053-051X
Three-dimensional interaction between a planet and an isothermal gaseous disk. I. Corotation and Lindblad torques and planet migration Peer-reviewed

H Tanaka, T Takeuchi, WR Ward

ASTROPHYSICAL JOURNAL　565　(2)　1257-1274　2002/02

DOI： 10.1086/324713 　

ISSN： 0004-637X
Viscosity in a dense planetary ring with self-gravitating particles Peer-reviewed

H Daisaka, H Tanaka, S Ida

ICARUS　154　(2)　296-312　2001/12

DOI： 10.1006/icar.2001.6716 　

ISSN： 0019-1035
High-accuracy statistical simulation of planetary accretion: II. Comparison with N-body simulation Peer-reviewed

S Inaba, H Tanaka, K Nakazawa, GW Wetherill, E Kokubo

ICARUS　149　(1)　235-250　2001/01

DOI： 10.1006/icar.2000.6533 　

ISSN： 0019-1035
The gas-drag effect on the orbital instability of a protoplanet system

Kazunori Iwasaki, Hidekazu Tanaka, Kiyoshi Nakazawa, Hiroyuki Emori

Publications of the Astronomical Society of Japan　53　(2)　321-329　2001
Publisher: Astronomical Society of Japan
DOI： 10.1093/pasj/53.2.321 　

ISSN： 0004-6264
Origin of high orbital eccentricity and inclination of asteroids

M Nagasawa, S Ida, H Tanaka

EARTH PLANETS AND SPACE　53　(11)　1085-1091　2001

DOI： 10.5636/eps.53.1085 　

ISSN： 1343-8832
Orbital migration of Neptune and orbital distribution of trans-Neptunian objects Peer-reviewed

S Ida, G Bryden, DNC Lin, H Tanaka

ASTROPHYSICAL JOURNAL　534　(1)　428-445　2000/05

DOI： 10.1086/308720 　

ISSN： 0004-637X
Orbital evolution of asteroids during depletion of the solar nebula Peer-reviewed

M Nagasawa, H Tanaka, S Ida

ASTRONOMICAL JOURNAL　119　(3)　1480-1497　2000/03

DOI： 10.1086/301246 　

ISSN： 0004-6256
Growth of a migrating protoplanet Peer-reviewed

H Tanaka, S Ida

ICARUS　139　(2)　350-366　1999/06

DOI： 10.1006/icar.1999.6107 　

ISSN： 0019-1035
Gravitational interaction between a protoplanet and a protoplanetary disk. I. Local three-dimensional simulations Peer-reviewed

K Miyoshi, T Takeuchi, H Tanaka, S Ida

ASTROPHYSICAL JOURNAL　516　(1)　451-464　1999/05

ISSN： 0004-637X
Grain formation in the ejecta of a supernova: the nucleation rate of grains heated by radiation Peer-reviewed

KK Tanaka, H Tanaka, K Nakazawa

PHYSICS AND CHEMISTRY OF THE EARTH PART C-SOLAR-TERRESTIAL AND PLANETARY SCIENCE　24　(5)　579-581　1999

ISSN： 1464-1917
High-accuracy statistical simulation of planetary accretion: I. Test of the accuracy by comparison with the solution to the stochastic coagulation equation

S Inaba, H Tanaka, K Ohtsuki, K Nakazawa

EARTH PLANETS AND SPACE　51　(3)　205-217　1999

DOI： 10.5636/eps.51.205 　

ISSN： 1343-8832
Shock heating due to accretion of a clumpy cloud onto a protoplanetary disk Peer-reviewed

KK Tanaka, H Tanaka, K Nakazawa, Y Nakagawa

ICARUS　134　(1)　137-154　1998/07

ISSN： 0019-1035
Accumulation Process in a Proto-lunar Disk (<Special Section>Origin and Evolution of the Moon)

TANAKA Hidekazu

Planetary People　6　(3)　199-204　1997/09/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
Distribution of planetesimals around a protoplanet in the nebula gas .2. Numerical simulations Peer-reviewed

H Tanaka, S Ida

ICARUS　125　(2)　302-316　1997/02

DOI： 10.1006/icar.1996.9998 　

ISSN： 0019-1035
Steady-state size distribution for the self-similar collision cascade Peer-reviewed

H Tanaka, S Inaba, K Nakazawa

ICARUS　123　(2)　450-455　1996/10

DOI： 10.1006/icar.1996.0170 　

ISSN： 0019-1035
Distribution of planetesimals around a protoplanet in the nebula gas .1. The semi-analytic calculation of the gravitational scattering by a protoplanet Peer-reviewed

H Tanaka, S Ida

ICARUS　120　(2)　371-386　1996/04

DOI： 10.1006/icar.1996.0057 　

ISSN： 0019-1035
VALIDITY OF THE STATISTICAL COAGULATION EQUATION AND RUNAWAY GROWTH OF PROTOPLANETS Peer-reviewed

H TANAKA, K NAKAZAWA

ICARUS　107　(2)　404-412　1994/02

DOI： 10.1006/icar.1994.1032 　

ISSN： 0019-1035
STOCHASTIC COAGULATION EQUATION AND VALIDITY OF THE STATISTICAL COAGULATION EQUATION

H TANAKA, K NAKAZAWA

JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY　45　(5)　361-381　1993

DOI： 10.5636/jgg.45.361 　

ISSN： 0022-1392

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Misc. 12

Report of the 5th Workshop on Satellite Systems

Tanigawa Takayuki, Kimura Jun, Okuzumi Satoshi, Sekine Yasuhito, Kuramoto Kiyoshi, Ohtsuki Keiji, Tanaka Hidekazu

Planetary People - The Japanese Society for Planetary Sciences　26　(4)　190-191　2017
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.26.4_190 　
Reply to "Comment on 'Simple improvements to classical bubble nucleation models'"

Kyoko K. Tanaka, Hidekazu Tanaka, Raymond Angelil, Jurg Diemand

PHYSICAL REVIEW E　94　(2)　2016/08

DOI： 10.1103/PhysRevE.94.026802 　

ISSN： 2470-0045

eISSN： 2470-0053
Report of Workshop on Satellite Systems 2015

Tanigawa T., Kimura J., Sekine Y., Kuramoto K., Ohtsuki K., Tanaka H., Okuzumi S.

Planetary People - The Japanese Society for Planetary Sciences　24　(4)　343-345　2015
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.24.4_343 　

ISSN： 0918-273X
P1-11 巨大惑星による原始惑星円盤ギャップの形成 : ギャップ構造と密度波の減衰(ポスターセッション1,ポスター発表)

金川和弘, 田中秀和, 武藤恭之, 谷川享行, 竹内拓

日本惑星科学会秋期講演会予稿集　2014　"P1-11"　2014/09/10
Publisher: 日本惑星科学会
O4-08 巨大惑星まわりの原始惑星系円盤ギャップ構造(口頭発表セッション4(惑星形成),口頭発表)

金川和弘, 武藤恭之, 田中秀和, 谷川享行, 竹内拓

日本惑星科学会秋期講演会予稿集　2013　"O4-08"　2013/11/20
Publisher: 日本惑星科学会
S01 高空隙ダストの静的圧縮を考慮した微惑星形成(特別セッション(最優秀発表賞選考),口頭発表)

片岡章雅, 田中秀和, 奥住聡, 和田浩二

日本惑星科学会秋期講演会予稿集　2013　S01　2013/11/20
Publisher: 日本惑星科学会
O8-06 原始惑星系円盤におけるダストの静的圧縮過程(口頭発表セッション8(室内実験II,惑星形成論I),口頭発表)

片岡章雅, 田中秀和, 奥住聡, 和田浩二

日本惑星科学会秋期講演会予稿集　2012　71-71　2012/10/24
Publisher: 日本惑星科学会
28pSP-1 Coagulation of charged dust aggregates in protoplanetary disks

Okuzumi Satoshi, Tanaka Hidekazu, Sakagami Masa-aki

Meeting abstracts of the Physical Society of Japan　64　(1)　225-225　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Growth and Disruption of Dust Aggregates by Collisions

K. Wada, H. Tanaka, T. Suyama, H. Kimura, T. Yamamoto

COSMIC DUST - NEAR AND FAR　414　347-355　2009
Numerical Simulation of Structure Evolution of Dust Aggregates Growing in Protoplanetary Disks. Exoplanets and Disks: Their Formation and Diversity

Suyama, T, Wada, K, Tanaka, H

Proceedings of the International Conference, Kailua-Kona, Hawaii　9-12 Mar. 2009　159-160　2009
ダストアグリゲイト衝突の数値シミュレーション(粉体物理の現状と展望,2006年度後期基礎物理学研究所研究会)

和田浩二, 田中秀和, 陶山徹, 木村宏, 山本哲生

物性研究　88　(2)　180-187　2007
Publisher: 物性研究刊行会
ISSN： 0525-2997

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惑星形成はダスト(μm以下のサイズの粒子が多数付着しアグリゲイトになっている)同士が衝突合体成長していくことから始まるが、その詳細は不明な点が多い。本研究では、ダスト同士の衝突によってその構造がどう変化するかを明らかにすることを目的に、アグリゲイト衝突の数値シミュレーションを行った。先行研究と比較するために、特に2次元のシミュレーションに焦点を絞り、アグリゲイトの構造変化(圧縮過程、破壊過程)をより定量的に評価することで、その衝突エネルギー依存性や構成粒子数依存性を明らかにした。
Report : Frontier Seminar 2006

TANAKA Hidekazu

Planetary people　15　(3)　107-109　2006/09/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X

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Books and Other Publications 1

Encyclopedia of exoplanet

S. Ida, M. Tamura, T. Ikoma, Y. Sekine ed

Asakura Publishing Co., Ltd.　2016/09/16

ISBN: 9784254150216

Presentations 21

3次元局所等温円盤におけるtype I惑星移動の線形計算

田中秀和

JpGU Meeting 2024　2024/05/30
Difficulty in grand-tack planetary migration model

Japan Geoscience Union Meeting 2023　2023/05/22
Compression of Dust Aggregates via Sequential Collisions with High Mass Ratios

Hidekazu Tanaka

Protostars and Planets VII
Planet-Disk Interactions and Orbital Evolution Invited

Sijme-Jan Paardekooper, Paul Duffell, Frederic S. Masse, Gordon Ogilvie, Hidekazu Tanaka, Ruobing Dong, Jeffrey Fung

Protostars and Planets VII　2023/04/14
An interpretation of exoplanet masses and orbital radii with a theoretical model of gas giant formation

Hidekazu Tanaka

2019 Fall Annual Meeting of the Astronomical Society of Japan　2019/09/12
Formation of Ice-mantled Grains in Cloud Cores and Its Effect on Interstellar Extinction Curves International-presentation Invited

TANAKA Hidekazu

Japanese-German disk/planet formation workshop　2018/09/25
Size Distribution of Ice-mantled Grains and Its Effect on Dust Growth International-presentation

TANAKA Hidekazu

10th RESCEU/Planet2 Symposium: Planet Formation around Snowline　2017/11/29
氷マントルダストのサイズ分布とダスト付着成長への影響

日本惑星科学会2017年秋季講演会　2017/09/27
氷マントルダストのサイズ分布とダスト付着成長への影響

日本天文学会2017年秋季年会　2017/09/11
氷マントルダストのサイズ分布と微惑星形成への影響

基研研究会「原始惑星系円盤」　2017/07/10
宇宙ダストの成長を分子動力学計算で観る

「自然科学における階層と全体」シンポジウム　2017/02/14
Dust Collision Simulation and Reexamination of Particle Interaction Models International-presentation

Japan-Germany Planet & Disk Workshop　2016/09/26
Dust growth in protoplanetary disks and reexamination of the particle interaction model International-presentation

Hidekazu Tanaka

Cosmic Dust IX　2016/08/15
Signs on Protoplanetary Disks Created by Planet Fomation Processes International-presentation

Hidekazu Tanaka, Kazuhiro Kanagawa, Murakawa Koji

Japan Geoscience Union Meeting　2016/05/22
Jupiter formation in a gas-depleted disk International-presentation

Hidekazu Tanaka, Takayuki Tanigawa

Protoplanetary Discussions　2016/03/07
Planetesimal formation via dust sticking International-presentation

Protoplanetary Disk Dynamics and Planet Formation　2015/09/29
S23-07 Evaporation of Planetesimals due to Planetesimal Bow Shocks

Tanaka Kyoko K, Yamamoto Tetsuo, Miura Hitoshi, Nagasawa Makiko, Nakamoto Taishi, Tanaka Hidekazu

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2011/10/23
27pTF-9 Study on mechanical interaction and dissipation process between small particles with MD simulations

Tanaka Hidekazu

Meeting abstracts of the Physical Society of Japan　2011/03/03
26aTF-1 Molecular dynamics simulations of nucleation from vapor

Tanaka Kyoko K, Tanaka Hidekazu, Yamamoto Tetsuo, Kawamura Katsuyuki

Meeting abstracts of the Physical Society of Japan　2011/03/03
320 Evaporation of Planetesimals due to Planetesimal Bow Shocks

Tanaka Kyoko K, Yamamoto Tetsuo, Miura Hitoshi, Nagasawa Makiko, Nakamoto Taishi, Tanaka Hidekazu

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2010/10/06
28pSP-1 Coagulation of charged dust aggregates in protoplanetary disks

Okuzumi Satoshi, Tanaka Hidekazu, Sakagami Masa-aki

Meeting abstracts of the Physical Society of Japan　2009/03/03

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Research Projects 20

巨大惑星の衛星系形成における初期条件と材料物質混合過程の解明

大槻圭史, 末次竜, 田中秀和, 寺居剛, 吉田二美, 杉浦圭祐

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 神戸大学

2022/04/01 - 2025/03/31

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本研究の目的は、巨大惑星周囲のガス流からの抵抗を受けつつ周惑星円盤に降着する固体粒子の軌道数値計算により衛星材料物質の供給・輸送過程を明らかにすることである。今年度はまず、原始惑星系円盤から巨大惑星周囲に流れ込むガス流の解析を進め、周惑星円盤へのガス降着における諸量の惑星質量に対する依存性に着目して詳しく調べた。手法としては、我々が先行研究で用いたのと同様の流体シミュレーションコードを用い、惑星質量を幅広い範囲で変えてその依存性を明らかにした。その結果、ガス降着帯の動径方向の幅は惑星質量とともに増加すること、惑星質量依存性は惑星質量が小さい場合と大きい場合によって異なること等が明らかになった。本研究で得られたガス降着帯幅の結果をもとに、周惑星円盤へのガスの質量降着率の準解析解を導出した。この準解析式は今後の惑星形成モデルの構築において有用となり得る。以上の内容は査読付き論文として投稿、出版された。 <BR> また、木星衛星系への材料物質供給とも関連して重要である木星トロヤ群小惑星の起源に制約を与えることを目的として、そのサイズ分布データ解析研究を実施した。手法として、すばる望遠鏡の超広視野カメラHyper Suprime-Camで取得された木星L5トロヤ群の微小小惑星のサイズ分布を解析し、同様の方法で得られていた木星L4トロヤ群の微小小惑星のサイズ分布と比較した。その結果、サイズ分布のべき指数は誤差の範囲で一致し、これらが共通のメカニズムを経て捕獲されたという理論モデルと矛盾しないことが明らかになった。これは、現在木星に向かっているNASAの木星トロヤ群小惑星探査機Lucyによる探査に備えて、重要な知見となる。以上の内容は査読付き論文として投稿、出版された。
原始惑星系円盤と系外惑星の統計をつなげる惑星種族合成理論の構築

田中秀和, 長澤真樹子, 小林浩, 田中佑希, 金川和弘

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2022/04/01 - 2025/03/31

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巨大惑星の形成と軌道進化についてそれぞれ以下の新たな知見を得ることができた。巨大惑星の形成については、ダストから巨大惑星までの連続過程を追う統一シミュレーションで円盤観測結果をもとにした高密度な構造をもつダストモデルを用いて再検討を行った。従来計算では高密度な構造をもつダストモデルを想定した場合、木星形成領域での微惑星形成が不可能であった。それに対し本再検討ではKusakaモデルにおける比較的低温な原始惑星系円盤を考えた場合、高密度ダストで木星形成領域での微惑星形成およびその後の急速な木星形成が実現されることを示した。なお従来研究で原始惑星系円盤の詳細な輻射輸送計算の結果、低温な原始惑星系円盤の方がより現実的であることが示されている。巨大惑星の軌道移動については、原始惑星系円盤内での惑星軌道進化に関し、国際的専門グループに参加し最新研究について議論を行い、レビュー論文の執筆を共著で行った。この論文で、巨大惑星のガス降着による成長を考慮した惑星の移動の数値流体計算では巨大惑星の移動は木星質量までの範囲では無視できるという結果が得らていることを確認した。これは太陽系形成におけるグランドタックモデルで想定される大規模な木星移動は起こり得ないことを示している。さらに、エキセントリックプラネット（高離心率巨大惑星）と原始惑星系円盤との相互作用についても調べた。高離心率巨大惑星の軌道進化は巨大惑星自身が形成する円盤ギャップの底のガス面密度以外にギャップ幅など詳細な構造にも依存することが分かった。これは巨大惑星と3：2の平均運動共鳴となる地点という比較的離れたガス円盤との相互作用が効いているためであることも確認した。今度これらの結果を本研究の高精度な惑星種族合成理論の構築に取り入れる。
巨大惑星の衛星系形成における初期条件と材料物質混合過程の解明

大槻圭史, 末次竜, 田中秀和, 寺居剛, 吉田二美, 杉浦圭祐

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 神戸大学

2022/04/01 - 2025/03/31
原始惑星系円盤と系外惑星の統計をつなげる惑星種族合成理論の構築

田中秀和, 長澤真樹子, 小林浩, 田中佑希, 金川和弘

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2022/04 - 2025/03
Development of the Microphysics of Dust Growth through a Large-scale Survey of Dust Numerical Simulations

Hidekazu Tanaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2019/04 - 2024/03

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In this study, the dust particle interaction model was developed based on our molecular dynamics simulations, and we constructed a highly accurate and detailed model for dust microphysics, by performing a large-scale survey of simulations of dust aggregate collisions with the developed particle interaction model. Molecular dynamics simulations have shown that strong energy dissipation occurs even in relatively low-velocity collisions. Numerical simulations of dust collisions incorporating this energy dissipation mechanism have revealed a universal collision velocity threshold for dust fragmentation and size distributions of the fragments at each collision. In addition, analytical models of the dust internal density and dust bounce conditions have been developed, which are useful for understanding dust in protoplanetary disks.
Theory for the Formation of Planetary Systems from Diverse Protoplanetary Disks

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: National Astronomical Observatory of Japan

2018/06 - 2024/03
Multicolor anatomy of protorplanetary disks: Towards understanding of planet formation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Ibaraki University

2017/04 - 2023/03
Probing Planet Formation from Detailed Structures in Protoplanetary Disks

Muto Takayuki, Momose Munetake, Fukagawa Misato, Tsukagoshi Takashi, Hanawa Tomoyuki, Soon Kang-Lou, Kataoka Akimasa, Kanagawa Kazuhiro D., Tanaka Hidekazu, Ono Tomohiro, Tomida Kengo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Kogakuin University

2014/04 - 2018/03

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High resolution observations of protoplanetary disks are now available with large telescopes and many protoplanetary disks show various structures. The goal of this research is to develope the methods to derive implications on physical status of protoplanetary disks and on planet formation processes from such observations. From the modeling work of the disk around HD 142527, we have found that there is a location in the disk where the dust particles are strongly concentrated. In the work on the shape of the gap structures produced by a planet embedded in the disk, our group is one of the first to derive the estimate of the planet mass in the disk around the HL Tau, in which several ring-like structures are found in the ALMA long-baseline campaign observations. In the work of linear stability analyses of Rossby wave instability, we have derived the marginally stable conditions of the instability, which have been a mystery over several decades.
Modelling of Collisional Disruption of Planetary Bodies via Large-scale Numerical Simulations

Tanaka Hidekazu, SUETSUGU Ryo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2014/04 - 2018/03

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In this work, by performing a large-scale survey of numerical simulations, we constructed an accurate and unified model of collisional disruption, which is a key process in various studies of planetary sciences. As the numerical methods, we used three kinds of methods, i.e., a SPH code, a mesh (iSALE) code, and a DEM code, which enable us to obtain the total ejecta mass at various impacts for planetary bodies with a wide size range from km-size to 1000km-size. <BR> Clarifying the resolution dependence of the collisional disruption, we developed the method to calculate the convergent value at high-resolution limit. From a survey of accurate numerical simulations applied this method to, we obtain a new scaling law of the total ejecta mass, which is valid for a wide range of parameters (sizes of colliding bodies, the impact velocity, and the angle) and succeeded in modelling the collisional disruption. We also applied this new model to Jovian planets formation and obtained constraints on it.
From disks to planets

Momose Munetake, KATAZA HIROKAZU, WADA KOJI, MURAKAWA KOJI, TANIGAWA TAKAYUKI, KANAGAWA KAZUHIRO, KIMURA HIROSHI, HIGHUCHI AYA, YASUI CHIKAKO, ROH SOONYOUNG

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Ibaraki University

2011/04/01 - 2016/03/31

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Our group studied various subjects related to the planet formation process in a protoplanetary disk. Major accomplishments achieved by our collaborations between astronomical observations, theories and impact experiments are as follows: (1) High resolution observations with ALMA and Subaru telescope have revealed that asymmetric structure is quite common in a protoplanetary disk. The regions of dust concentration in such structure may be responsible for the formation of rocky planetesimals. (2) Our theories on planetary gaps show that the ring-like features seen in several protoplanetary disks with different ages can be explained by a gap carved by a protoplanet, suggesting that a planetary system may form in various modes with different timescales. (3) Modeling of chemical reaction network in the formation site of a star-disk system has successfully reproduced spatial distributions and relative abundances of gas molecules, including HDO and N2H+, in a protoplanetary disk.
Theoretical study on an unified process of planetesimal formation and accumulation

TANAKA Hidekazu, KOBAYASHI Hiroshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Hokkaido University

2010 - 2012

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We investigated the growth process from dust grains to planetesimals and their radial migration, taking into account the evolution of their internal density. Because of their radial migration, solid bodies are concentrated inside of 10AU and grow to km-sized planetesimals. In this planetesimal-forming region, the surface density of the solid component is enhanced by a factor of ～10, compared with the original value. The growing solid bodies have a highly porous structure, which helps their growth to planetesimals. The large enhancement in the solid surface density accelerates growth of cores of Jovian planets.
Construction of a comprehensive model of dust in exoplanetary systems Competitive

YAMAMOTO Tetsuo, TANAKA Hidekazu, KIMURA Hiroshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Hokkaido University

2009 - 2011

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The objective of the present project is to construct a comprehensive model to provide a basis of deciphering the results of observations of exoplanetary systems ranging from protoplanetary disks to debris disks. Another objective is to combine astrophysical studies and planetary material ones. The followings are the major thema:1) collisional evolution of dust aggregates, 2) low temperature crystallization of dust in space, and 3) optics of dust aggregates.
Modeling the Planetesimal formation Process and Its Comparison to Observations of Vega-like stars Competitive

Taku TAKEUCHI, 相川祐理, 中川義次, 田中秀和

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

System: Grants-in-Aid for Scientific Research(基盤研究(C))

Category: 基盤研究(C)

Institution: 神戸大学->北海道大学->東京工業大学

2008 - 2011

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(抄録なし)
Theoretical studies on formation of extrasolar planetary systems through numerical simulations

IDA Shigeru, TANAKA Hidekazu, INUTSUKA Shuichiro, KOKUBO Eiichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tokyo Institute of Technology

2004 - 2008
Theoretical Studies on Evolution of Dust Size and Structure in Protoplanetary Disks Competitive

Hidekazu TANAKA, 和田浩二

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

System: Grants-in-Aid for Scientific Research(基盤研究(C))

Category: 基盤研究(C)

Institution: 北海道大学

2006 - 2007

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The bulk density of dust aggregates is an important factor in collisional growth of dust in protoplanetary disks. The density of aggregates changes the coupling with the disk gas, which governs the motion of aggregates in disks. Collisional outcomes also depend on the aggregate density. We perform three-dimensional N-body simulations of sequential collisions of aggregates composed of a number of sub-micron-sized icy particles in order to investigate the density evolution of dust aggregates growing in protoplanetary disks. In the present simulation of sequential collisions, as the initial a...
Dust settling and growth in protoplanetary disks and its implication for formation of extrasolar planets Competitive

Shigeru IDA, 田中秀和, 北村良実, 小久保英一郎

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

System: Grants-in-Aid for Scientific Research(基盤研究(B))

Category: 基盤研究(B)

Institution: 東京工業大学

2004 - 2006

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Planetary systems are formed in protoplanetary disks that are by-products of star formation. The disks consist of 98-99 wt.% of H-He gas and residual dust grains. The dust coagulates into planetesimals and the planetesimals accrete into terrestria planets and cores of jovian planets.In this study, we investigated details of processes from dust to planetesimals. Collisions between dust grains do not necessarily result in coalescence. The conditions for coalescence of disruption were derived by numerical simulations (Wada et al. 2007). Self-gravitational instability of dust to clumps (planete...
Evolution of internal mechanical structure of dust aggregates in protoplanetary disks Competitive

System: Grant-in-Aid for Scientific Research

2006 -
高空間分解能数値流体計算による「惑星落下問題」の再検討

田中秀和

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 東京工業大学

2003 - 2004

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本研究の昨年度の結果から,惑星がその重力で原始惑星系円盤にギャップを形成することで,惑星落下の問題は回避できることが明らかになった。又,この惑星によるギャップ形成は原始惑星系円盤の温度に大きく左右されることもわかった.従来用いられてきた林モデルにおける比較的高めの円盤温度を採用すると,ギャップ形成は惑星がかなり大きくなるまで(地球質量の10倍程度まで)起こらないことが明らかになった.しかし,林モデルにおける円盤モデルの見積もりは非常に簡単なもので,不定性は大きい.例えば,保温効果として働くダストが成長しそのサイズが変化すると円盤の温度は大きな影響を受けるが,そのような変化は林モデルでは考慮されていない.そこで今年度は,原始惑星系円盤でのダスト成長と沈殿の数値計算を行ない,ダスト沈殿成長による原始惑星系円盤の温度の進化を調べた.原始惑星系円盤の加熱源は,中心星からの放射加熱が主要なものである.原始惑星系円盤内でダストが赤道面へ沈殿していくと,円盤が中心星からの光を受ける面は下降していく.その結果,円盤が中心星から受けるエネルギー量は減少し,円盤温度は低下する.この様なダスト沈殿成長による円盤温度進化を、Chiangによる2層モデルを用いて計算した.我々の結果によると,ダスト沈殿による光吸収面の降下は,太陽質量を持つ星の周りの百万年程度で進行する.これは従来の研究と調和的である.この光吸収面の降下に伴う円盤冷却の結果,百万年以降には,円盤温度は林モデルの温度の1/3以下に低下する.その結果,氷粒子は水星軌道以遠で存在できるようになる.これより地球形成領域でも氷微惑星が存在したと考えられる.この温度低下は,ギャップ形成にも大きな影響を与える.これによりギャップ形成は容易になり,火星サイズ程度でもギャップ形成は可能になる.従って,この温度低下は惑星落下問題においても重要な結果である.
The origin of diversity of extrasolar planets formation of giant gasous planets and orbital evolution Competitive

井田茂, Kiyoshi NAKAZAWA, 田中秀和, 大槻圭史, 中澤清, 榎森啓元, 渡辺誠一郎, 井田茂

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

System: Grants-in-Aid for Scientific Research(基盤研究(B))

Category: 基盤研究(B)

Institution: 東京工業大学

1997 - 1999

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About 30 extrasolar planets have been discovered since 1995. They would be giant planets like Jupiter and Saturn in the Solar system, because the present detection method limits planet mass that can be detectable. About half of them have very short orbital period (shorter than that of Mercury), while the other half have large orbital eccentricity. We have tried to explain the diversity of the extrasolar planets by generalizing the standard theory of the Solar system.This year, we investigated the formation of giant planets and their orbital stability more deeply. Giant planets are formed as...
Planetary Formation relevant to Titius-Bode's Law Competitive

中沢清, Kiyoshi NAKAZAWA, 井田茂, 大槻圭史, 榎森啓元, 田中秀和, 井田茂

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

System: Grants-in-Aid for Scientific Research(一般研究(B), 基盤研究(B))

Category: 一般研究(B), 基盤研究(B)

Institution: 東京工業大学

1995 - 1997

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In the last decade great efforts have been dedicated to solve two big problems in studies for planetary formation processes. One problem is that we could not explain the formation of Jovian planets. such as Jupiter and Saturn in the proto solar nebula which is considered to dissipate in a very little time as equal as about ten million years. And another is that we could not explain present distances between planets.Until now a sequence of the planetary formation that terrestrial planets orbiting near the Sun accumulated faster than the Jovian planets in the distant orbit from the Sun has be...

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Works 3

Dust Growth in Protoplanetary Disks

2010 -
Planetesimal Formation through Direct Dust Growth

2007 -
Planetesimal Formation through Direct Dust Growth

2007 -

Social Activities 1

北大-大垣東高校間双方向遠隔授業プロジェクト

2015/10/23 -

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本プロジェクトは, 北海道大学理学研究科地球惑星科学専攻の研究室と岡山県立鴨方高等学校の『宇宙の科学』の教室とを高帯域ネットワークJGNで結び, 高品位な映像/音声を双方向にやり取りしながら, 研究の最先端から高校へ授業を直接届けることを目的したものである.田中の講演題目は「第2の地球を探そう ~太陽系外惑星の探査~」であった.