Self-Sustaining Vortices in Protoplanetary Disks: Setting the Stage for Planetary System Formation

Abstract

The core accretion scenario of planet formation assumes that planetesimals and planetary embryos are formed during the primordial, gaseous phases of the protoplanetary disk. However, how the dust particles overcome the traditional growth barriers is not well understood. The recently proposed viscous ring-instability may explain the concentric rings observed in protoplanetary disks by assuming that the dust grains can reduce the gas conductivity, which can weaken the magneto-rotational instability. We present an analysis of this model with the help of GPU-based numerical hydrodynamic simulations of coupled gas and dust in the thin-disk limit. During the evolution of the disk the dusty rings become Rossby unstable and break up into a cascade of small-scale vortices. The vortices form secularly stable dusty structures, which could be sites of planetesimal formation by the streaming instability as well as direct gravitational collapse. The phenomenon of self-sustaining vortices is consistent with observational constraints of exoplanets and sets a favorable environment for planetary system formation.

arXiv comment10 pages, accepted for publication in MNRAS

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• Analysis of the arm-like structure in the outer disk of PDS 70. Spiral density wave or vortex?
• Primordial Dusty Rings and Episodic Outbursts in Protoplanetary Discs
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• Origin of Ca II emission around polluted white dwarfs
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• Dust-driven vortex cascades originating at water snow regions: A pathway to planetesimal formation