| セミナー: | CPS セミナー |
| 日時: | 2025 年 3月 18日(火)15:00 |
| 場所: | 神戸大学 自然科学総合研究棟 3号館 6階セミナー室(609)+オンライン（ハイブリッド開催） |
| 講演者: | James Wadsley (Professor, MacMaster University) |
| タイトル: | Asteroids from pebbles: Early stages of planet formation |
| 要旨: |
Our understanding of planet formation has changed dramatically with the discoveries of young stellar systems with disks, the large population of extra-solar planets and the behaviour of mixtures of gas and dust present in young proto-planetary disks. Planet formation begins with the micron-sized dust found in the interstellar medium.
In disks it collides to form up to mm-sized grains that feel drag that sends them rapidly into the star which would seemingly end planet formation. The streaming instability is a general behaviour of gas and dust mixtures that rapidly enhances the dust density locally. Dust rich regions soon reach densities where gravity collapses them into loose rubble piles with expected properties similar to those of asteroids and icy outer solar system bodies. These are too large to suffer from drag and gas and can go on to form planets. I present results of simulations of the streaming instability, implications for proto-planetary disks, asteroids and planet formation and targets for future work.
Bio part: James Wadsley is a professor of Physics and Astronomy at McMaster University in Hamilton, Canada. He is originally from Australia (B.Sc. Applied Math., Monash). He completed a Ph.D. in Astronomy and Astrophysics at the University of Toronto and joined the N-body Shop in Seattle, Washington where he was a developer of the Gasoline, and later Changa, public parallel hydrodynamics/N-body codes. He joined McMaster in 2000. He has published research in areas including Cosmology, Galaxy Formation, Dark Matter, Star Formation, Proto- planetary Disks and Planet Formation, Hydrodynamics, Numerical Methods and Parallel Computing. |
| キーワード: | planet formation, numerical simulation |
| 世話人: | 斎藤 貴之 |
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