Institute of Astronomy

Gap formation and stability in non-isothermal disks

SpeakerTalk DateTalk Series
Min-Kai Lin28 July 2014Across HR 2014 Posters

Abstract

It has been established that disk-planet interaction can lead to the formation of large-scale structures in protoplanetary disks, such as disk vortices, because of hydrodynamical instabilities of gap edges. Indeed, this may explain recent observation of asymmetric dust distributions in transition disks. However, models thus far have employed nearly-isothermal disks, whereas the theory of the edge instability was in fact developed for adiabatic disks. We generalize the study of planetary gap stability to non-isothermal disks by including an energy equation. We present customized 2D numerical simulations of disk-planet interaction with parametrized cooling, and use the simulations to study both the linear and non-linear evolution of planetary gap edges. We find that increasing the cooling timescale generally favors the instability, resulting in longer vortex lifetimes. We suggest this is attributed to entropy generation by planet-induced spiral shocks.

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