Dead Zones and the Diversity of Exoplanetary Systems

Дата и время публикации : 2011-11-22T16:14:35Z

Авторы публикации и институты :
Yasuhiro Hasegawa
Ralph E. Pudritz

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 2 pages, 1 figure, published in Proceedings IAU Symposium No. 276
Первичная категория: astro-ph.EP

Все категории : astro-ph.EP

Краткий обзор статьи: Planetary migration provides a theoretical basis for the observed diversity of exoplanetary systems. We demonstrate that dust settling – an inescapable feature of disk evolution – gives even more rapid type I migration by up to a factor of about 2 than occurs in disks with fully mixed dust. On the other hand, type II migration becomes slower by a factor of 2 due to dust settling. This even more problematic type I migration can be resolved by the presence of a dead zone; the inner, high density region of a disk which features a low level of turbulence. We show that enhanced dust settling in the dead zone leaves a dusty wall at its outer edge. Back-heating of the dead zone by this wall produces a positive radial gradient for the disk temperature, which acts as a barrier for type I migration.

Category: Physics