Open AccessTwo‐dimensional models of layered protoplanetary discs – II. The effect of a residual viscosity in the dead zone
Author(s) -
Wünsch R.,
Gawryszczak A.,
Klahr H.,
Różyczka M.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.09986.x
Subject(s) - physics , radiative transfer , accretion (finance) , viscosity , instability , dead zone , residual , mechanics , astrophysics , rotational symmetry , planet , accretion disc , thermodynamics , optics , oceanography , algorithm , computer science , geology
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 one‐dimensional hydrocode, we identify these regions, and discuss conditions in which layered discs can give rise to FU Ori phenomena.