Two-dimensional models of layered protoplanetary discs - II. The effect of a residual viscosity in the dead zone

Abstract

We study axisymmetric models of layered protoplanetary discs taking radiative transfer effects into account, and allowing for a residual viscosity in the dead zone. We also explore the effect of different viscosity prescriptions. In addition to the ring instability reported in the first paper of the series we find an oscillatory instability of the dead zone, accompanied by variations of the accretion rate onto the central star. We provide a simplified analytical description explaining the mechanism of the oscillations. Finally, we find that the residual viscosity enables stationary accretion in large regions of layered discs. Based on results obtained with the help of a simple 1-D hydrocode we identify these regions, and discuss conditions in which layered discs can give rise to FU~Orionis phenomena.

arXiv comment9 pages, 5 figures, accepted for publication in MNRAS

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• Mean-Field Magnetohydrodynamics of Accretion Disks
• Fundamental Vibrational Transition of CO during the Outburst of EX Lupi in 2008
• Gap opening beyond dead zones by photoevaporation
• The dynamics of inner dead-zone boundaries in protoplanetary disks
• Variability of the inner dead zone edge in 2D radiation hydrodynamic simulations
• Global magnetohydrodynamic simulations of the inner regions of protoplanetary discs. I. Zero-net flux regime
• The role of detailed gas and dust opacities in shaping the evolution of the inner disc edge subject to episodic accretion
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