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SUMMARY:Atmospheres as Probes of the Interiors and Formation pathways of E
 arth\, super-Earths and sub-Neptunes - Professor Hilke Schlichting (UCLA)
DTSTART:20251028T130000Z
DTEND:20251028T140000Z
UID:TALK237472@talks.cam.ac.uk
CONTACT:James Rogers
DESCRIPTION:Super-Earths and sub-Neptunes are the most abundant exoplanets
  discovered in our galaxy to date. However\, much of their nature and orig
 in remains shrouded in mystery. Generally speaking\, super-Earths and sub-
 Neptunes are thought to have formed  as one population with primordial hyd
 rogen-dominated envelopes. However\, most super-Earths lost their primordi
 al atmospheres via thermally driven winds. In my talk\, I will present glo
 bal chemical equilibrium models of Earth\, super-Earths and sub-Neptunes. 
 I will show that magma-ocean atmosphere interactions expected in sub-Neptu
 nes exoplanets lead to signatures in their transmission spectra that are r
 eadily observable with JWST. In addition\, hydrogen is efficiently sequest
 ered into the interior\, oxidizing iron and endogenously producing water. 
 I will conclude by discussing possible parallels between Earth’s formati
 on and that of super-Earths\, shedding new light on Earth’s primary wate
 r reservoir\, origin of the light elements in its iron core and oxidation 
 state.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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