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2010MNRAS.403..211T - Mon. Not. R. Astron. Soc., 403, 211-228 (2010/March-3)
Dust settling in magnetorotationally-driven turbulent discs - II. The pervasiveness of the streaming instability and its consequences.
TILLEY D.A., BALSARA D.S., BRITTAIN S.D. and RETTIG T.
Abstract (from CDS):
When significant sedimentation occurs, the dust will participate in a streaming instability that significantly enhances the dust density. We show that the streaming instability is pervasive at many of the outer radial stations in a disc. We characterize the scaleheights of dust whose size ranges from a few micrometres all the way up to a few centimetres. We find that for spherical grains, a power-law relationship develops for the scaleheight with grain size, with a slope that is slightly steeper than -1/2. The sedimentation is strongest in the outer disc and increases for large grains. The results presented here show that direct measurements of grain settling can be made by ALMA and we present favourable conditions for observability. The streaming instability should also be directly observable and we provide conditions for directly observing it. We calculate collision rates and growth rates for the dust grains in our simulations of various sizes colliding with other grains, and find that these rates are significantly enhanced through the density enhancement arising from the streaming instability.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): instabilities - MHD - turbulence - methods: numerical - planetary systems: protoplanetary discs
Simbad objects: 3
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