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SUMMARY:Retrieval of initial planetary disk properties and the Radius Vall
 ey of Steam\, Photoevaporation and Migration - Remo Burn (MPIA\, Heidelber
 g)
DTSTART:20221018T120000Z
DTEND:20221018T130000Z
UID:TALK183161@talks.cam.ac.uk
CONTACT:Dr Emily Sandford
DESCRIPTION:Planet formation models rely on initial conditions for which t
 he observed\, evolved population of disks is not representative. Therefore
 \, a retrieval approach can be useful for constraining e.g. the initial di
 sk mass and radius - but also the viscous alpha parameter. A first attempt
  reveals inconsistencies indicating that our simple viscous disk and dust 
 evolution model needs adjustments.\nThe planetary mass and composition dis
 tribution from a planetary population synthesis approach based on such ini
 tial conditions\, can be used in long-term planetary evolution models inst
 ead of an arbitrary choice. In particular\, formation models with planetar
 y migration predict a large number of water-rich planets inconsistent with
  the standard mass-loss explanation for the observed radius valley. We sho
 w that such a coupled formation and evolution model reproduces observation
 s if water is mixed with H/He as (supercritical) vapor and the valley sepa
 rates rocky from water-rich planets.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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