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SUMMARY:Formation &amp\; Evolution of Close-in Exoplanets - Hilke Schlicht
 ing
DTSTART:20181031T131500Z
DTEND:20181031T141500Z
UID:TALK113035@talks.cam.ac.uk
CONTACT:Dr Giovanni Rosotti
DESCRIPTION:Exoplanets with radii between 1-4 Earth radii are the most abu
 ndant planets known to date and regularly appear in tightly-packed multipl
 e-planet systems. A significant fraction of them are enshrouded in gaseous
  envelopes that are massive enough to significantly contribute to the plan
 et's radius. I will review current planet formation theories and present a
  simple analytical prescription\, accounting self-consistently for gas acc
 retion\, cooling and mass-loss of super-earths. I will demonstrate that th
 e luminosity of the cooling rocky core\, can erode light envelopes while p
 reserving heavy ones resulting in a valley in the radius distribution of s
 mall exoplanets even in the absence of any photo-evaporation. I will concl
 ude with a comparison of observations and theoretical predictions\, highli
 ghting that even super-Earths that appear as barren rocky cores today like
 ly formed with primordial hydrogen and helium envelopes and discuss the si
 gnature of giant impacts in close-in exoplanet systems.
LOCATION:Sackler Lecture Theatre\, IoA
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