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SUMMARY:(Delrez) Probing the emission spectra of ultra-hot Jupiters using 
 ground-based occultation photometry. (Meru) Understanding the morphology o
 f the protoplanetary disc\, Elias 2-27 - Laetitia Delrez &amp\; Farzana Me
 ru (Cambridge)
DTSTART:20170301T160000Z
DTEND:20170301T170000Z
UID:TALK69719@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:(Delrez) By observing the occultation (secondary eclipse) of a
  transiting exoplanet by its host star in the (near-)infrared\, the therma
 l emission of its dayside can be retrieved. Using this technique at differ
 ent wavelengths in the (near-)infrared allows to probe the emission spectr
 um of the planet’s dayside\, from which insights on the vertical thermal
  structure and chemical composition of its atmosphere can be gained. \nVer
 y hot and inflated gas giants in very-short-period orbits around their sta
 rs are the most favourable targets for such measurements\, thanks to their
  high temperature and large size. The atmospheres of such ultra-hot Jupite
 rs are expected to be conducive for gaseous TiO and VO\, which could cause
  thermal inversions (i.e. stratospheres) by reprocessing incident UV/visib
 le irradiation to heat in the upper atmospheric layers.\nThermal inversion
 s have been previously claimed for several hot Jupiters based on Spitzer o
 bservations\, but these results were recently found to suffer from signifi
 cant systematic biases and were thus seriously called into question. Never
 theless\, hottest planets are still the best candidates to host thermal in
 versions in their dayside atmospheres\, the only planet showing clear evid
 ence for a temperature inversion to date being WASP-33b\, which is one of 
 the most highly irradiated hot Jupiters currently known.\nIn this talk\, I
  will present results of an intense ground-based photometric campaign aimi
 ng at probing the emission spectra of WASP-103b and WASP-121b\, two ultra-
 hot Jupiters orbiting their host stars just beyond the Roche limit.\n\n(Me
 ru) Recent observations of protoplanetary discs are starting to hint that 
 the young turbulent self-gravitating disc phase is more important for plan
 et formation than previously thought. In contrast to the standard paradigm
  for planet formation\, these results may now have pushed the likely era o
 f planet formation into the brief\, early self-gravitating stage of disc e
 volution. One such example is the Elias 2-27 protoplanetary disc which exh
 ibits strong spiral structures out to approximately 250au. Through the res
 ults of recent numerical simulations I will discuss whether Elias 2-27 cou
 ld be the first observation of a self-gravitating disc.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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