Turbulent Thermal Diffusion: A Way to Concentrate Dust in Protoplanetary Discs
arXiv:1512.02538 · doi:10.1093/mnras/stv2895
Abstract
Turbulence acting on mixes of gas and particles generally evenly diffuses the latter through the former. However, in the presence of background gas temperature gradients a phenomenon known as turbulent thermal diffusion appears as a particle drift velocity (rather than a diffusive term). This process moves particles from hot regions to cold ones. We rederive turbulent thermal diffusion using astrophysical language and demonstrate that it could play a major role in protoplanetary discs by concentrating particles by factors of tens. Such a concentration would set the stage for collective behavior such as the streaming instability and hence planetesimal formation.
11 pages, 1 figure, accepted for publication, MNRAS
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