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SUMMARY:A forecast for high winds and clouds: Exoplanet atmospheres at low
  and high resolution - Tom Louden (Warwick)
DTSTART:20160525T150000Z
DTEND:20160525T160000Z
UID:TALK65069@talks.cam.ac.uk
CONTACT:Dr B.-O. Demory
DESCRIPTION:The study of exoplanet atmospheres has developed rapidly over 
 the last few years\, we are now reaching a point where enough hot jupiter 
 atmospheres have been studied in detail that we can begin to perform compa
 rative planetology to figure out the underlying processes.\n\nWASP-52b is 
 a low density Hot jupiter with a particularly high transmission signal tha
 t makes it an excellent target for transmission spectroscopy. Using ACAM o
 n the WHT we recovered a transmission spectrum between 400 and 900 nm on t
 wo separate nights. A Gaussian Process method was used to remove common mo
 de systematics. Despite having a similar radiation environment to HD 18973
 3b\, WASP-52b presents a very different transmission spectrum\, hinting at
  the complexity and variety of planetary atmospheres.\n\nSecondly\, I will
  show that high resolution spectroscopy present an opportunity to spatiall
 y resolve the atmospheres of exoplanets. I will present evidence that the 
 atmosphere of the hot Jupiter HD 189733b has a strong eastward motion\, wi
 th red-shifted absorption detected on the leading limb of the planet and b
 lue-shifted absorption on the trailing limb. The results are based on a ti
 me-resolved model of the sodium transmission spectrum measured with the HA
 RPS spectrograph. Our results demonstrate the feasibility of studying the 
 weather patterns of distant planets from the ground.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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