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Astrophysics Colloquium

Formation and Evolution of Close-in Exoplanets
Presented by Hilke Schlichting
University of California, Los Angeles

Thursday, December 13, 2018
11:00 A.M. in 169-336

Abstract
Exoplanets with radii between 1-4 Earth radii are the most abundant planets known to date and regularly appear in tightly-packed multiple-planet systems. A significant fraction of them are enshrouded in gaseous envelopes that are massive enough to significantly contribute to the planet's radius. I will review current planet formation theories and present a simple analytical prescription, accounting self-consistently for gas accretion, cooling and mass-loss of super-earths. I will demonstrate that the luminosity of the cooling rocky core can erode light envelopes while preserving heavy ones resulting in a valley in the radius distribution of small exoplanets, even in the absence of any photo-evaporation. I will conclude with a comparison of observations and theoretical predictions, highlighting that even super-Earths that appear as barren rocky cores today likely formed with primordial hydrogen and helium envelopes and discuss the signature of giant impacts in close-in exoplanet systems.

JPL Contact: Renyu Hu (4-6090)


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