= Eiichiro Kokubo
{c}
<Eiichiro Kokubo> uses numerical <dynamics> to investigate <planet formation>. His work with <Shigeru Ida> identified a regime of <oligarchic growth>, where neighboring large <protoplanets> accrete smaller <planetesimals> while remaining dynamically separated.
The large bodies alter the very population from which they grow: their <gravity> increases small-body random <velocities>, changing subsequent collision and capture rates. Following this feedback distinguishes the oligarchic regime from a simple extrapolation in which the largest object keeps outgrowing all its neighbors indefinitely.<Oligarchic Growth of Protoplanets by Eiichiro Kokubo and Shigeru Ida>[Abstract: self-consistent velocity evolution, regulated growth and orbital separation]{ref}
\Image[https://bunshun.ismcdn.jp/mwimgs/3/5/1500wm/img_357676dcc68b10d67550e4b6f3cc9a8a812480.jpg]
{title=Portrait of <Eiichiro Kokubo>}
{description=External portrait hosted by Bunshun Online / Bungeishunju.}
{source=https://bunshun.jp/articles/-/9070}
{width=250}
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