Dynamics of Dust-Gas Interactions in Protoplanetary Disks and Implications for Planetesimal Formation
Hui Li (LANL) - October 1, 2018 at 12:10 pm
Abstract: The majority of young low-mass stars are surrounded by disks, consisted of large reservoirs of gas and dust out of which planetary systems eventually form. In the recent years, high spatial resolution observations of such disks by ALMA have revealed many details that are providing interesting constraints on the disk physics as well as dust dynamics, both of which are essential for understanding planet formation. We carry out high-resolution, two-dimensional hydrodynamic simulations of global disks, including the effects of dust feedback. We find that disks display a rich variety of behaviors, depending on the mutual interactions of dust and gas. These features include both the quasi-axisymmetric rings and non-asymmetric dust traps which are unstable to several possible instabilities. We also show the effects of streaming instability in global disk simulations. These effects are providing a promising new way to promote the formation of many planetesimals in such disks. We produce synthetic dust emission images using our simulation results and discuss the comparison between simulations and observations.
The seminar will be held in 131A Campbell Hall.
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