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SUMMARY:Devolatilization during rocky planet formation: Observations\, the
 ories\, and implications - Haiyang Wang (Copenhagen)
DTSTART:20250304T130000Z
DTEND:20250304T140000Z
UID:TALK227272@talks.cam.ac.uk
CONTACT:Dr Dolev Bashi
DESCRIPTION:Devolatilization — depletion of volatile elements (e.g.\, C\
 , O\, S\, Na and K) in rocky planets relative to their host stars — is a
  common feature that has been observed in both the Solar System and exopla
 net systems. Various mechanisms have been proposed to explain this common 
 feature\, ranging from incomplete condensation of dust materials from an u
 ltra-hot nebula with a host stellar composition\, partial evaporation of p
 lanetesimals by collisional kinetic energy and/or short-lived radiogenic h
 eating\, and vaporization of rock-forming volatiles by giant impacts. Whil
 e summarizing historical data and understandings of this potentially unive
 rsal phenomenon of devolatilization in rocky planet formation\, I will als
 o present in this talk a novel model based on state-of-the-art pebble accr
 etion theory\, constrained by volatile depletion of Earth and Mars\, that 
 lend support to a hybrid formation scenario where the inner solar system r
 ocky planets grow by a combination of rapid pebble accretion and a prolong
 ed period of planetesimal accretion and giant impacts.\n\nExtending this m
 odel to exoplanet systems\, aided by disc observations with JWST and ALMA 
 and high-precision bulk-density observations with current and near-future 
 facilities (e.g.\, CARMENES\, SPECULOOS\, HARPS3\, and PLATO)\, will help 
 make quantitative predictions of volatile budget and bulk composition of r
 ocky exoplanets. The outcome will provide an important testbed for evaluat
 ing rocky exoplanetary habitability\, together with unprecedented atmosphe
 ric observations with JWST and upcoming ELT. It will further provide guida
 nce on target selections for next-generation space missions dedicated to s
 earching for habitable worlds and exo-life signals (e.g.\, HWO and LIFE).
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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