3/24/16: SO/NOAO Joint Colloquium Series: Anders Johansen, Lund University
Title: Forming Planets in Protoplanetary Discs
Abstract:
Planets form in protoplanetary discs around young stars. Observations of such discs reveal that dust grains grow to millimeter-to-centimeter-sized pebbles. These pebbles can play important roles for planet formation. Pebbles are concentrated in the turbulent gas, and the over-dense filaments collapse gravitationally to form planetesimals with a wide range of sizes. The largest planetesimals continue to grow by accreting the remaining pebbles. The growth is so rapid that the cores of gas giants and super-Earths with gaseous envelopes can form within a few million years, before the dissipation of the gaseous protoplanetary disc. I will present a coherent picture of planet formation, from dust grains to fully-formed planets, based on such pebble accretion models.
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