協辦單位
NQU
協辦單位
Kinmen/edu
協辦單位
ASIAA
贊助單位
MOST
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名稱Title
2018天文年會
國立金門大學
5月18日至20日

論文摘要

Lifting dust particles by the vertical shear instability

[ Poster PS63 ]

Min-Kai Lin (ASIAA)

In the standard picture of planet formation, dust grains first settle into the midplane of protoplanetary discs, forming a dense particle layer, before undergoing planetesimal formation. However, this picture assumes a laminar disc. In recent years, several hydrodynamic sources of turbulence in protoplanetary discs have been identified. This includes the vertical shear instability (VSI), relevant to the irradiated parts of protoplanetary discs. We perform high resolution dusty-gas simulations to study how particle dynamics is affected by VSI-turbulence. We find small particles at Solar metallicity cannot settle against the VSI, and remain well mixed with the gas throughout the disc's vertical extent. However, boosting the metallicity helps the particles to settle due dust-induced buoyancy forces, itself arising from the back-reaction of dust drag on the gas. Our results restrict the particle sizes and metallicities relevant for planetesimal formation in order for dust to settling against the VSI.