Vortices in self-gravitating disks

Details Vortices in self-gravitating disks Vortices in self-gravitating disks

2008-09-30

arxiv.org/abs/0809.5220v1

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of Cool Stars, Stellar Systems and The Sun, 15th Cambridge Workshop, St. Andrews, Scotland, July

Scientific paper

10.1063/1.3099129

Vortices are believed to greatly help the formation of km sized planetesimals by collecting dust particles in their centers. However, vortex dynamics is commonly studied in non-self-gravitating disks. The main goal here is to examine the effects of disk self-gravity on the vortex dynamics via numerical simulations. In the self-gravitating case, when quasi-steady gravitoturbulent state is reached, vortices appear as transient structures undergoing recurring phases of formation, growth to sizes comparable to a local Jeans scale, and eventual shearing and destruction due to gravitational instability. Each phase lasts over 2-3 orbital periods. Vortices and density waves appear to be coupled implying that, in general, one should consider both vortex and density wave modes for a proper understanding of self-gravitating disk dynamics. Our results imply that given such an irregular and rapidly changing, transient character of vortex evolution in self-gravitating disks it may be difficult for such vortices to effectively trap dust particles in their centers that is a necessary process towards planet formation.

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