Planetesimal Formation by Sublimation of Icy Dust Aggregates: effect of H2O vapor pressure

被引：0

作者：

Saito, Etsuko ^{[1
]}

Sirono, Sin-iti ^{[1
]}

机构：

[1] Nagoya Univ, Tikusa Ku, Nagoya, Aichi 4648601, Japan

来源：

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY | 2009年 / 1158卷

关键词：

planetesimal; dust; aggregate; sublimation; gravitational instability; protoplanetary disk;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Planetesimal formation is still one of the most important unresolved problems in planetary science. In this study, I propose a scenario for planetesimal formation. Sublimation of H(2)O ice in an icy dust aggregate leads to the concentration of silicate dust core particles at a particular heliocentric distance. I show that the dust column density can reach the critical density required for the self-gravitational instability of the dust layer. The dust surface density increases locally by a factor of 10 in 6,000 years for 10 cm-sized aggregates. The timescale is shortened by the sublimated H(2)O vapor.

引用

页码：261 / 262

页数：2