253 citations · 3k across the 95 of their papers we have counts for
12 papers · 1 filter
Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD 167042
Bun'ei Sato, Eri Toyota, Masashi Omiya +9
We report on the detection of four extrasolar planets orbiting evolved intermediate-mass stars from a precise Doppler survey of G and K giants at Okayama Astrophysical Observatory.…
Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies
Takayuki R. Saitoh, Hiroshi Daisaka, Eiichiro Kokubo +5
We investigated the evolution of interacting disk galaxies using high-resolution -body/SPH simulations, taking into account the multiphase nature of the interstellar medium (ISM…
Toward first-principle simulations of galaxy formation: I. How should we choose star formation criteria in high-resolution simulations of disk galaxies?
Takayuki R. Saitoh, Hiroshi Daisaka, Eiichiro Kokubo +5
We performed 3-dimensional N-body/SPH simulations to study how mass resolution and other model parameters such as the star formation efficiency parameter, C* and the threshold dens…
Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Del, xi Aql, and HD 81688
Bun'ei Sato, Hideyuki Izumiura, Eri Toyota +11
We report the detection of 3 new extrasolar planets from the precise Doppler survey of G and K giants at Okayama Astrophysical Observatory. The host stars, namely, 18 Del (G6 III),…
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…
A Substellar Companion to the Intermediate-Mass Giant 11 Com
Y. J. Liu, Bun'ei Sato, G. Zhao +16
We report the detection of a substellar companion orbiting the intermediate-mass giant star 11 Com (G8 III). Precise Doppler measurements of the star from Xinglong station and Okay…
-body Simulation of Planetesimal Formation Through Gravitational Instability of a Dust Layer
Shugo Michikoshi, Shu-ichiro Inutsuka, Eiichiro Kokubo +1
We performed N-body simulations of a dust layer without a gas component and examined the formation process of planetesimals. We found that the formation process of planetesimals ca…
High-Resolution Simulations of a Moon-Forming Impact and Post-Impact Evolution
Keiichi Wada, Eiichiro Kokubo, Junichiro Makino
In order to examine the ``giant impact hypothesis'' for the Moon formation, we run the first grid-based, high-resolution hydrodynamic simulations for an impact between proto-Earth…
Three-Body Affairs in the Outer Solar System
Yoko Funato, Junichiro Makino, Piet Hut +2
Recent observations (Burnes2002,Veillet2002,Margot2002a) have revealed an unexpectedly high binary fraction among the Trans-Neptunian Objects (TNOs) that populate the Kuiper Belt.…
The formation of Kuiper-belt Binaries through Exchange Reactions
Yoko Funato, Junichiro Makino, Piet Hut +2
Recent observations have revealed an unexpectedly high binary fraction among the Trans-Neptunian Objects (TNOs) that populate the Kuiper-belt. The discovered binaries have four cha…
Kuiper-belt Binary Formation through Exchange Reactions
Yoko Funato, Junichiro Makino, Piet Hut +2
Recent observations (Burnes et al 2002,Veillet et al 2002, Margot et al 2002a) have revealed an unexpectedly high binary fraction among the Trans-Neptunian Objects (TNOs) that popu…
Time Symmetrization Meta-Algorithms
Piet Hut, Yoko Funato, Eiichiro Kokubo +2
We present two types of meta-algorithm that can greatly improve the accuracy of existing algorithms for integrating the equations of motion of dynamical systems. The first meta-alg…