open access

https://hdl.handle.net/2115/34713

Sublimation of Icy Dust in Planetary Systems

日本語

2008-03-31

北海道大学低温科学研究所

Low Temperature Science

66

65-71

2章 惑星形成と氷微粒子

In a disk with a low optical depth, dust particles radially drift inward by the Poynting-Robertson (P-R) drag rather than are blown out by stellar radiation pressure following destructive collisions. We investigate the radial distribution of icy dust composed of pure ice and refractory materials in dust-debris disks taking into account the P-R drag and ice sublimation. We find that icy dust particles form a dust ring by their pile-ups at the edge of their sublimation zone, where they sublime substantially at the temperature 100-110K. The distance of the dust ring is 20-35AU from the central star with its luminosity L* ≲ 30L◎ and 65 (L*/100L◎) ^1/2 AU for L* ≳ 30L◎, where L◎ is the solar luminosity. The effective optical depth is enhanced by a factor of 2 for L* ≲ 100L◎ and more than 10 for L* ≳ 100L◎. The optical depth of the outer icy dust disk exceeds that of the inner disk filled with refractory particles, the residue of ice sublimation, which are further subjected to the P-R effect. As a result, an inner hole is formed inside the sublimation zone together with a dust ring along the outer edge of the hole.

紀要論文

Version of Record

1880-7593