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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9452
DTSTART:20251008T150000Z
DTEND:20251008T160000Z
DTSTAMP:20260413T084920Z
LAST-MODIFIED:20251006T175154Z
LOCATION:6515 Sterling Hall
SUMMARY:The Geology of Planetary Atmospheres\, Astronomy Colloquium\, 
 Prof. Ray Pierrehumbert  \, Halley Professor of Physics\, University o
 f Oxford
DESCRIPTION:In this lecture\, I will highlight some examples of the in
 terplay between planetary envelopes and planetary interiors\, focusing
  on lava planets\, "hot rocks" (rocky planets too hot to support surfa
 ce liquid water but not hot enough to have molten surfaces)\, the deep
  carbon cycle on habitable rocky worlds\, and sub-Neptunes. Recent JWS
 T data driving these inquiries will be surveyed. The general programme
  is to determine the extent to which astronomical observations -- whic
 h probe only the outer skin of a planet's volatile envelope (if presen
 t)-- together with mass\, radius and age data can constrain the compos
 ition and structure of the interior\, which cannot be directly observe
 d.  sub-Neptunes present an especially interesting case\, because many
  currently accessible targets have a predominantly rocky composition (
 by mass)\, surrounded by a lower molecular weight envelope which inter
 acts physically and chemically with a permanent magma ocean at the sil
 icate/envelope interface.  For sub-Neptunes with a sufficiently massiv
 e envelope\, the interface with the silicate mantle can be hot enough 
 to drive the silicate itself supercritical\, blurring the distinction 
 between mantle and envelope.  Lack of experimental data on equations o
 f state\, geochemical reaction constants and opacities currently const
 itutes a serious impediment to progress in modelling sub-Neptune therm
 ochemical structure and evolution.
URL:https://www.physics.wisc.edu/events/?id=9452
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