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SUMMARY:Radiative transfer in exoplanetary atmospheres - Kevin Heng (Bern)
DTSTART:20141203T163000Z
DTEND:20141203T173000Z
UID:TALK55110@talks.cam.ac.uk
CONTACT:Dr B.-O. Demory
DESCRIPTION:Understanding radiative transfer is an integral part of predic
 ting synthetic spectra from exoplanetary atmospheres and also interpreting
  measured spectra of them.  A commonly used technique is two-stream radiat
 ive transfer\, which approximates the passage of radiation as a pair of ou
 tgoing and incoming fluxes.  I will demonstrate that the two-stream soluti
 ons\, the diffusion approximation and analytical temperature-pressure prof
 iles all originate from the same set of governing equations\, implying tha
 t the values of the Eddington coefficients adopted need to be self-consist
 ent across all three treatments.  Surprisingly\, the Eddington closure pro
 duces unphysical effects and should be avoided.  I will briefly discuss ap
 plications: computing synthetic spectra\, the runaway greenhouse effect an
 d detached convective regions.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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