Saturation of the corotation resonance in a gaseous disk

Details Saturation of the corotation resonance in a gaseous disk Saturation of the corotation resonance in a gaseous disk

2002-08-20

arxiv.org/abs/astro-ph/0208363v2

Astrophys.J. 587 (2003) 398-406

Astronomy and Astrophysics

Astrophysics

23 pages, 1 figure, revised version, to be published in the Astrophysical Journal

Scientific paper

10.1086/368178

We determine the torque exerted in a steady state by an external potential on a three-dimensional gaseous disk at a non-coorbital corotation resonance. Our model accounts for the feedback of the torque on the surface density and vorticity in the corotation region, and assumes that the disk has a barotropic equation of state and a nonzero effective viscosity. The ratio of the torque to the value given by the formula of Goldreich & Tremaine depends essentially on a single dimensionless parameter, which quantifies the extent to which the resonance is saturated. We discuss the implications for the eccentricity evolution of young planets.

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