435 citations · 3k across the 62 of their papers we have counts for
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Effect of Dust Size on the Near-Infrared Spectra (1.0-5.0 m) of Brown Dwarf Atmospheres
Satoko Sorahana, Hiroshi Kobayashi, Kyoko K. Tanaka
In this study, we demonstrate the dependence of atmospheric dust size on the near-infrared spectra of ten L dwarfs, and constrain the sizes of dust grains in each L dwarf atmospher…
Rapid formation of Gas Giant Planets via Collisional Coagulation from Dust Grains to Planetary Cores
Hiroshi Kobayashi, Hidekazu Tanaka
Gas-giant planets, such as Jupiter, Saturn and massive exoplanets, were formed via the gas accretion onto the solid cores each with a mass of roughly ten Earth masses. However, rap…
Coagulation Instability in Protoplanetary Disks: A Novel Mechanism Connecting Collisional Growth and Hydrodynamical Clumping of Dust Particles
Ryosuke T. Tominaga, Shu-ichiro Inutsuka, Hiroshi Kobayashi
We present a new instability driven by a combination of coagulation and radial drift of dust particles. We refer to this instability as ``coagulation instability" and regard it as…
The Growth of Protoplanets via the Accretion of Small Bodies in Disks Perturbed by the Planetary Gravity
Tatsuya Okamura, Hiroshi Kobayashi
Planets grow via the collisional accretion of small bodies in a protoplanetary disk. Such small bodies feel strong gas drag and their orbits are significantly affected by the gas f…
SPH Simulations for Shape Deformation of Rubble-Pile Asteroids Through Spinup: The Challenge for Making Top-Shaped Asteroids Ryugu and Bennu
Keisuke Sugiura, Hiroshi Kobayashi, Sei-ichiro Watanabe +3
Asteroid Ryugu and asteroid Bennu, which were recently visited by spacecraft Hayabusa2 and OSIRIS-REx, respectively, are spinning top-shaped rubble piles. Other axisymmetric top-sh…
Collisional Growth and Fragmentation of Dust Aggregates with Low Mass Ratios. I: Critical Collision Velocity for Water Ice
Yukihiko Hasegawa, Takeru K. Suzuki, Hidekazu Tanaka +2
We investigated fundamental processes of collisional sticking and fragmentation of dust aggregates by carrying out N-body simulations of submicron-sized icy dust monomers. We exami…