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SUMMARY:Strange New Worlds - Prof Hilke Schlichting\, Professor of Exoplan
 ets & Planetary Science\; Associate Dean for Research\, Physical Sciences\
 , UCLA
DTSTART:20260512T150000Z
DTEND:20260512T160000Z
UID:TALK246538@talks.cam.ac.uk
CONTACT:Ruby Ng
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 h
 ydrogen-dominated envelopes. However\, most super-Earths lost their primo
 rdial atmospheres via thermally driven winds. In my talk\, I will present 
 new planet formation and evolution models that include the interplay betwe
 en physics and chemistry and apply them to Earth\, super-Earths and sub-N
 eptunes. I will show that magma ocean - atmosphere interactions expected i
 n sub-Neptune exoplanets lead to signatures in their transmission spectra
  that are readily observable with JWST. In addition\, hydrogen is efficien
 tly sequestered into the interior\, oxidizing iron and endogenously produc
 ing water. I will conclude by discussing possible parallels between Earth
 ’s formation and that of super-Earths\, shedding new light on Earth’s 
 primary water reservoir\, origin of the light elements in its iron core an
 d oxidation state.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy
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