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CATEGORIES:Exoplanet Seminars
SUMMARY:Transmission spectroscopy of hot gas giant atmosph
 eres - Tom Evans (Exeter)
DTSTART;TZID=Europe/London:20160302T160000
DTEND;TZID=Europe/London:20160302T170000
UID:TALK63351AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/63351
DESCRIPTION:Transmission spectroscopy observations allow us to
  probe the compositional makeup of transiting exop
 lanet atmospheres. Hot gas giants are ideal target
 s for such observations\, due to their extended at
 mospheric scale heights\, strong absorption featur
 es and frequent transits. The number of measured t
 ransmission spectra has now increased to a point w
 here we can make the first tentative attempts at c
 omparative planetology by scrutinising trends in t
 he overall population. Results to date reveal a di
 versity of atmosphere types ranging from clear to 
 cloudy\, although the chemistry and physics of the
  putative aerosols remain largely unknown. Thermal
  emission measurements also imply a distinction be
 tween atmospheres with a thermal inversion (strato
 sphere) and those without\, with the cause of this
  difference not yet understood. In this context\, 
 I will present new HST observations for the extrem
 e planet WASP-121b\, an ultra-hot gas giant in a p
 olar orbit just beyond the Roche limit.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
CONTACT:Dr B.-O. Demory
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