Faculty Profiles - KOBAYASHI Hiroshi

Papers - KOBAYASHI Hiroshi

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Rapid Formation of Gas-giant Planets via Collisional Coagulation from Dust Grains to Planetary Cores Reviewed

Kobayashi, Hiroshi; Tanaka, Hidekazu

ASTROPHYSICAL JOURNAL Vol. 922 page： id. 16 2021.11

Formation of planetary atmospheres. Analytical estimation of vapor production via planetary impacts Reviewed

Miyayama, Ryushi; Kobayashi, Hiroshi

Astronomy & Astrophysics Vol. 688 page： A103 2024.8

Frequencies of Warm Debris Disks Based on Point Source Catalogs of Spitzer, WISE, and Gaia Reviewed

Mizuki, Toshiyuki; Momose, Munetake; Aizawa, Masataka; Kobayashi, Hiroshi

The Astronomical Journal Vol. 167 ( 6 ) page： 275 2024.6

Sticking of Fine Particles in High-velocity Impact: Application to Size Distribution of Dust Grains in a Debris Disk Reviewed

Kadono, T; Kobayashi, H; Yokoyama, M

ASTROPHYSICAL JOURNAL Vol. 960 ( 1 ) 2024.1

A Primordial Origin for the Gas-rich Debris Disks around Intermediate-mass Stars Reviewed International coauthorship

Nakatani, R; Turner, NJ; Hasegawa, Y; Cataldi, G; Aikawa, Y; Marino, S; Kobayashi, H

Vol. 959 ( 2 ) 2023.12

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

Hiroshi Kobayashi, Hidekazu Tanaka

ASTROPHYSICAL JOURNAL Vol. 954 ( 2 ) 2023.9

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing Ltd

Thanks to "dust-to-planet" simulations (DTPSs), which treat the collisional evolution directly from dust to giant-planet cores in a protoplanetary disk, we showed that giant-planet cores are formed in & LSIM;10 au in several 105 yr, because porous pebbles grow into planetesimals via collisions prior to drift in 10 au. However, such porous pebbles are unlikely to reproduce the polarized millimeter wavelength light observed from protoplanetary disks. We thus investigate gas-giant core formation with nonporous pebbles via DTPSs. Even nonporous bodies can grow into planetesimals and massive cores that are possible to be gas giants are also formed in several 105 yr. The rapid core formation is mainly via the accretion of planetesimals produced by collisional coagulation of pebbles drifting from the outer disk. The formation mechanism is similar to the case with porous pebbles, while core formation occurs in a wider region (5-10 au) than that with porous pebbles. Although pebble growth and core formation depend on the disk temperature, core formation is likely to occur with disk temperatures in typical optical thick disks around protostars.

DOI： 10.3847/1538-4357/ace96b

Web of Science

Dust Enrichment and Grain Growth in a Smooth Disk around the DG Tau Protostar Revealed by ALMA Triple Bands Frequency Observations Reviewed International coauthorship

Ohashi, S., Momose, M., Kataoka, A., Higuchi, A.E., Tsukagoshi, T., Ueda, T., Codella, C., Podio, L., Hanawa, T., Sakai, N., Kobayashi, H., Okuzumi, S., and Tanaka, H.

The Astrophysical Journal Vol. 954 ( 2 ) page： 110 2023.9

A Constraint on the Amount of Hydrogen from the CO Chemistry in Debris Disks Reviewed

Iwasaki, K; Kobayashi, H; Higuchi, AE; Aikawa, Y

ASTROPHYSICAL JOURNAL Vol. 950 ( 1 ) 2023.6

Heavy-element accretion by proto-Jupiter in a massive planetesimal disc, revisited Reviewed International coauthorship

Shibata, S.; Helled, R.; Kobayashi, H.

Monthly Notices of the Royal Astronomical Society Vol. 519 ( 2 ) page： 1713 - 1731 2023.2

Collisional Growth and Fragmentation of Dust Aggregates. II. Mass Distribution of Icy Fragments Reviewed

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

The Astrophysical Journal Vol. 944 ( 1 ) page： id.38 2023.2

Spitzer/IRS Full Spectral Modeling to Characterize Mineralogical Properties of Silicate Dust in Heavily Obscured AGNs Reviewed

Tsuchikawa, T.; Kaneda, H.; Oyabu, S.; Kokusho, T.; Kobayashi, H.; Toba, Y.

The Astrophysical Journal Vol. 941 ( 1 ) page： id.50 2022.12

Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. II. Dust-ring Formation Mediated by Backreaction and Fragmentation Reviewed

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

The Astrophysical Journal Vol. 940 ( 2 ) page： id.152 2022.12

Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. I. First Numerical Study of Accelerated Dust Growth and Dust Concentration at Outer Radii Reviewed

Tominaga, Ryosuke T.; Kobayashi, Hiroshi; Inutsuka, Shu-ichiro

The Astrophysical Journal Vol. 937 ( 1 ) page： id.21 2022.9

Formation of Dust Clumps with Sub-Jupiter Mass and Cold Shadowed Region in Gravitationally Unstable Disk around Class 0/I Protostar in L1527 IRS Reviewed International coauthorship

Ohashi, Satoshi; Nakatani, Riouhei; Liu, Hauyu Baobab; Kobayashi, Hiroshi; Zhang, Yichen; Hanawa, Tomoyuki; Sakai, Nami

The Astrophysical Journal Vol. 934 ( 2 ) page： id.163 2022.8

No Evidence of the Significant Grain Growth but Tentative Discovery of Disk Substructure in a Disk around the Class I Protostar L1489 IRS

Ohashi Satoshi, Kobayashi Hiroshi, Sai Jinshi, Sakai Nami

ASTROPHYSICAL JOURNAL Vol. 933 ( 1 ) 2022.7

Coagulation Instability in Protoplanetary Disks: A Novel Mechanism Connecting Collisional Growth and Hydrodynamical Clumping of Dust Particles Reviewed

Tominaga, Ryosuke, T.; Inutsuka, Shu-ichiro, Kobayashi, Hiroshi

ASTROPHYSICAL JOURNAL Vol. 923 page： id.34 2021.12

Effect of Dust Size on the Near-infrared Spectra (1.0-5.0 μm) of Brown Dwarf Atmospheres Reviewed

Sorahana, Satoko; Kobayashi, Hiroshi ; Tanaka, Kyoko K.

ASTROPHYSICAL JOURNAL Vol. 919 page： id. 117 2021.10

SPH simulations for shape deformation of rubble-pile asteroids through spinup: The challenge for making top-shaped asteroids Ryugu and Bennu Reviewed

Sugiura, Keisuke; Kobayashi, Hiroshi ; Watanabe, Sei-ichiro search by orcid ; Genda, Hidenori search by orcid ; Hyodo, Ryuki ; Inutsuka, Shu-ichiro

Icarus 2021.9

The Growth of Protoplanets via the Accretion of Small Bodies in Disks Perturbed by the Planetary Gravity Reviewed

Okamura, Tatsuya; Kobayashi, Hiroshi

ASTROPHYSICAL JOURNAL Vol. 916 page： id. 109 2021.8

A systematic study of silicate absorption features in heavily obscured AGNs observed by Spitzer/IRS Reviewed

Tsuchikawa, T. ; Kaneda, H. ; Oyabu, S. ; Kokusho, T. ; Kobayashi, H. ; Yamagishi, M. ; Toba, Y.

ASTRONOMY & ASTROPHYSICS Vol. 651 page： A117 2021.7

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Papers - KOBAYASHI Hiroshi