Planetesimal formation by an axisymmetric radial bump of the column density of the gas in a protoplanetary disk

Isamu K. Onishi, Minoru Sekiya

研究成果: ジャーナルへの寄稿学術誌査読

8 被引用数 (Scopus)

抄録

We investigate the effect of a radial pressure bump in a protoplanetary disk on planetesimal formation. We performed the two-dimensional numerical simulation of the dynamical interaction of solid particles and gas with an initially defined pressure bump under the assumption of axisymmetry. The aim of this work is to elucidate the effects of the stellar vertical gravity that were omitted in a previous study. Our results are very different from the previous study, which omitted the vertical gravity. Because dust particles settle toward the midplane because of the vertical gravity to form a thin dust layer, the regions outside of the dust layer are scarcely affected by the back-reaction of the dust. Hence, the gas column density keeps its initial profile with a bump, and dust particles migrate toward the bump. In addition, the turbulence due to the Kelvin-Helmholtz instability caused by the difference of the azimuthal velocities between the inside and outside of the dust layer is suppressed where the radial pressure gradient is reduced by the pressure bump. The dust settling proceeds further where the turbulence is weak, and a number of dust clumps are formed. The dust density in some clumps exceeds the Roche density. Planetesimals are considered to be formed from these clumps owing to the self-gravity.

本文言語英語
論文番号50
ジャーナルearth, planets and space
69
1
DOI
出版ステータス出版済み - 12月 1 2017

!!!All Science Journal Classification (ASJC) codes

  • 地質学
  • 宇宙惑星科学

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