Evolution of protoplanetary discs and their implications on the formation of planets
Astronomy and astrophysics
Friday 13 February 2015
to 11:30 at
Bertram Bitsch (Lund University)
The formation of planets with gaseous envelopes takes place in protoplanetary accretion discs on time-scales of several millions of years. Small dust particles stick to each other to form pebbles, pebbles concentrate in the turbulent flow to form planetesimals and planetary embryos and grow to planets, which undergo substantial radial migration. All these processes are influenced by the underlying structure of the protoplanetary disc, specifically the profiles of temperature, gas scale height and density.
Protoplanetary disc models with both viscous and stellar heating show several bumps and dips in temperature, scale height and density caused by transitions in opacity. These play an important role in the formation of planets, as they can act as sweet spots for the formation of planetesimals via the streaming instability and affect the direction and magnitude of type-I-migration.
In this talk, I will show how the structure and evolution of the protoplanetary disc in time influences the formation and migration of planetary cores and planets and I will discuss what this implies for the structure of the resulting planetary systems.