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SUMMARY:LCLU Coffee - How to Build a Planet - Anders Johansen (Lund)
DTSTART:20230817T100000Z
DTEND:20230817T110000Z
UID:TALK203308@talks.cam.ac.uk
CONTACT:Paul B. Rimmer
DESCRIPTION:*Rapid accretion of rocky planets and the outgassing of their 
 first atmospheres*\n\nTerrestrial planets have traditionally been thought 
 to form by collisions between protoplanets taking place mostly after the d
 issipation of the protoplanetary disc\, on time-scales of 30-100 million y
 ears. I present here a new theoretical model where terrestrial planets gro
 w instead by accreting small pebbles in the protoplanetary disc within 3-5
  million years. I discuss how the immense pebble accretion heat leads to e
 xtensive melting of the growing planets and to the emergence of deep magma
  oceans. Volatiles such as water\, carbon and nitrogen are accreted with t
 he pebbles and partitioned between atmosphere\, magma ocean and core. The 
 end of the accretion phase leads to rapid crystallisation of the magma oce
 an and outgassing of the first atmosphere. I will show how the atmospheric
  composition of young planets is key to understanding the origin of life.
LOCATION:Battcock\, Room TBA
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