22 March 2019
Time: 2:30 - 2:30pm
Speaker: Cassandra Hall
Venue: G.O. Jones Building, Room 610
With increased observational capabilities from instruments such as ALMA and SPHERE, it has become abundantly clear that substructure in accretion discs around stars is the norm, rather than the exception. Gravitational instability, which occurs when the disc mass is a sufficient fraction of the host star, has been offered as an explanation to an interesting subset of this substructure, spiral arms. I give an introduction to protoplanetary discs and why they are important, what gravitational instability is, and why it may, or may not, be responsible for some of the features that we see.