2:05 PM - 2:20 PM
[PPS09-02] 3D radiation hydrodynamics simulations of gravito-turbulence in protoplanetary disks
Keywords:protoplanetary disk, gravitational instability, turbulence
In this paper, we present 3D radiation hydrodynamics simulations in a local shearing box to explore the outcome of self-gravity in a protoplanetary disk with realistic thermodynamics. We found that gravito-turbulence is sustained for a finite range of the surface density, from 20 to 50 times the one in the minimum mass solar nebula at 50AU, when the grazing angle of the irradiation is 0.02. The flow is laminar below the range while fragmentation occurs above the range. In the range of gravito-turbulence, the Toomre parameter decreases monotonically from 1 to 0.7 as the surface density increases while an effective cooling time takes an almost constant value that depends on the radius. The turbulent motions are supersonic at all heights, which dissipates through both shock waves and compressional heating. The compressional motions, occurring near the midplane, create upward flows, which not only contribute to supporting the disk but also to transporting the dissipated energy to the disk surfaces. We also show that the simple cooling function with a constant cooling time does not approximate the realistic cooling.