Planet のバックアップ(No.74)

惑星セミナー2021 †

惑星セミナーは原則として毎週木曜日の15:00から開催しています。（連絡係：星野遥, 荒川創太, 高橋実道，古家健次）
astro-phセミナーは毎週月曜日の12:00から開催しています。（連絡係：Carol Kwok，瀧哲朗）

日程	発表	タイトル	Remarks	担当
前期第1回 4/15 15:00-	All members	Self-introduction		古家
前期第2回 4/22 15:00-	All members	Self-introduction		古家
前期第3回 5/13 14:00-	Teruyuki Hirano (ABC)	Near Infrared Spectroscopy as a Powerful Tool to Probe Exoplanetary Systems	14:00	古家
前期第4回 5/20 15:00-	Ryuki Hyodo (ISAS/JAXA)	Planetesimal formation -- Around the snow line and the "no-drift" mechanism		荒川
前期第XX回 6/24 15:00-	Hiroaki Kaneko (titech)			星野

5/20 Ryuki Hyodo (ISAS/JAXA), Planetesimal formation -- Around the snow line and the "no-drift" mechanism: Forming planetesimals in protoplanetary disks is a major challenge in our current understanding of planet formation. Icy pebbles mixed with silicate dust formed at the outer disk drift inward due to the gas drag. We performed 1D diffusion-advection simulations that include the back-reaction (the inertia) to radial drift and diffusion of icy pebbles and silicate dust, ice sublimation, the release of silicate dust, and their recycling through the recondensation and sticking onto pebbles outside the snow line. In this talk, I will present how icy pebbles and silicate dust pile up around the snow line. I also report a new mechanism, the “no-drift” runaway pile-up, that leads to a runaway accumulation of pebbles in disks, thus favoring the formation of planetesimals by streaming and/or gravitational instabilities. References: Hyodo et al. 2021 A&A, 646, A14; Ida et al. 2021 A&A, 646, A13; Hyodo et al. 2021 A&A, 645, L9