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SUMMARY:A giant cloud of hydrogen escaping a Neptune-mass exoplanet - Davi
 d Ehrenreich (Université de Genèva)
DTSTART:20160216T140000Z
DTEND:20160216T150000Z
UID:TALK63877@talks.cam.ac.uk
CONTACT:Greg Willatt
DESCRIPTION:Exoplanets close to their parent stars could lose some fractio
 n of their atmospheres because of the extreme level of irradiation they re
 ceive.  Atmospheric escape has been observed during the past 12 years for 
 hot gas giants\, as large ultraviolet absorption signals during transits. 
  Whereas these giants are massive enough to resist evaporation\, lower-mas
 s planets could be dramatically impacted by the mass loss.  In particular\
 , hot rocky planets observed by Corot and Kepler might have lost all of th
 eir atmosphere\, having begun as Neptune-like.  After recalling the state-
 of-the-art knowledge about upper atmospheres of exoplanets\, I will presen
 t recent Hubble Space Telescope observations of the Neptune-mass exoplanet
  GJ 436b.  These new data are allowing substantial developments in the fie
 ld of star-planet interaction and open exciting observational perspectives
 \, which I will discuss in the context of forthcoming exoplanet surveys.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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