Dust Clumping in Outer Turbulent Protoplanetary Disks
Title：Dust Clumping in Outer Turbulent Protoplanetary Disks
Speaker：Pinghui Huang (University of Victoria)
Time：10:30-11:30 am Dec. 22th (Friday)
Tencent Meeting：576-157-8290 password: 6360
Location: Large conference room, 3rd floor
Abstract：
The Vertical Shear Instability (VSI) is a robust hydrodynamic phenomenon that occurs within a range of tens to hundreds of astronomical units (AU) in protoplanetary disks, significantly impacting disk accretion and evolution. The Rossby Wave Instability (RWI) has the capability to generate anticyclonic vortices, effectively trapping dust and thereby promoting dust concentration and growth. Simultaneously, the Streaming Instability (SI) offers a promising mechanism for creating strong dust clumps, which contribute to the formation of planetesimals. In this study, we utilized the newly developed multifluid dust module in Athena++ to conduct 3D global simulations, showcasing the coexistence of VSI, RWI, and SI within protoplanetary disks. Although the weak zonal flows induced by VSI and the subtle dusty vortices arising from RWI may not achieve complete dust trapping, these mild pressure variations do make significant contributions to dust clumping driven by SI. When all three instabilities coexist, they result in more pronounced dust clumping compared to scenarios where only a single instability is active.
CV：Dr. Pinghui Huang got his Ph. D in 2019.7 in Astronomy from Purple Mountain Observatory. He was a visiting scholar at Los Alamos National Laboratory and Rice University during 2017-2019. Then he became a postdoc in Tsinghua University from 2019.9 and now a postdoc in University of Victoria since 2023.1. His research interests include computational astrophysics (magneto-)hydrodynamics, planet-disk interactions and planet formation.附件下载：
