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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20140220T103000
DTEND;TZID=Atlantic/Canary:20140220T113000
UID:iactalks-615
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/615
CREATED:2014-02-20T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: Tests, lessons, and successes of exoplanet transit observations wi
 th the GTC 
DESCRIPTION: Tests, lessons, and successes of exoplanet transit observation
 s with the GTC \nDr. Enric Pallé\n\nOur group is presently conducting an 
 observational campaign, using the  10-meter Gran Telescopio Canarias (GTC)
 , to obtain the transmission  spectrum of several exoplanets during a tran
 sit event. The GTC  instrument OSIRIS is used in its long-slit spectroscop
 ic mode, covering  the spectral range of 520-1040 nm, and observations are
  taken using a  set of custom-built slits of various, broad, widths. We in
 tegrate the  stellar flux of both stars in different wavelength regions p
 roducing  several light curves and fit transit models in order to obtain 
 the  star-to-planet radius ratio Rp/Rs across wavelength. A Markov Chain  
 Monte Carlo (MCMC) Bayesian approach is used for the transit fitting.  Wit
 h our instrumental setup, OSIRIS has been able to reach precisions  down t
 o 250 ppm (WASP-48b, V=11.06 mag) for each color light curve 10 nm  wide, 
 in a single transit.  Central transit timing accuracies have been  measure
 d down to 6 seconds.\nHere, we will present refined planet parameters, th
 e  detection of planet color signatures, and the transmission spectrum of 
 a  set of know transiting exoplanets, namely: WASP-43b, HAT-P-32b,  HAT-P-
 12b,  WASP-48b. We will also discuss the capabilities and  limitations of 
 GTC with current and future instrumentation, and the role  of GTC as tool 
 for the follow up of faint Kepler targets. In  particular, we will present
  the GTC observations of the intriguing  evaporating planet KIC 12557548b,
  for which we performed simultaneous  color light curves, and a search for
  alkali elements in its planetary  tail. Other setups for observations (Br
 oad and tunable filter  photometry) have also been used and will be briefl
 y discussed. The  lessons learned from our GTC exoplanet observations will
  be discussed in  the context of the E-ELT future capabilities.\n 
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