17 papers · 1 filter
Thermal Effects of Circumplanetary Disk Formation around Proto-Gas Giant Planets
Masahiro N. Machida
The formation of a circumplanetary disk and accretion of angular momentum onto a protoplanetary system are investigated using 3D hydrodynamical simulations. The local region around…
Magneto-Hydrodynamics of Population III Star Formation
Masahiro N. Machida, Tomoaki Matsumoto, Shu-ichiro Inutsuka
Jet driving and fragmentation process in collapsing primordial cloud are studied using three-dimensional MHD nested grid simulations. Starting from a rotating magnetized spherical…
Binary Formation in Star-Forming Clouds with Various Metallicities
Masahiro N. Machida
Cloud evolution for various metallicities is investigated by three-dimensional nested grid simulations, in which the initial ratio of rotational to gravitational energy of the host…
Angular Momentum Accretion onto a Gas Giant Planet
Masahiro N. Machida, Eiichiro Kokubo, Shu-ichiro Inutsuka +1
We investigate the accretion of angular momentum onto a protoplanet system using three-dimensional hydrodynamical simulations. We consider a local region around a protoplanet in a…
The Effect of Poloidal Magnetic Field on Type I Planetary Migration: Significance of Magnetic Resonance
Takayuki Muto, Masahiro N. Machida, Shu-ichiro Inutsuka
We study the effect of poloidal magnetic field on type I planetary migration by linear perturbation analysis in the shearing-sheet approximation and the analytic results are compar…
Conditions for the Formation of First-Star Binaries
Masahiro N. Machida, Kazuyuki Omukai, Tomoaki Matsumoto +1
The fragmentation process of primordial-gas cores during prestellar collapse is studied using three-dimensional nested-grid hydrodynamics. Starting from the initial central number…