Dead Zones and the Diversity of Exoplanetary Systems

Details Dead Zones and the Diversity of Exoplanetary Systems Dead Zones and the Diversity of Exoplanetary Systems

2011-11-22

arxiv.org/abs/1111.5238v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

2 pages, 1 figure, published in Proceedings IAU Symposium No. 276

Scientific paper

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.

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