Spitzer Lightcurves of WASP-18

Details Spitzer Lightcurves of WASP-18 Spitzer Lightcurves of WASP-18

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.4402m&link_type=abstract

American Astronomical Society, ESS meeting #2, #44.02

Astronomy and Astrophysics

Astronomy

Scientific paper

WASP-18b is a massive hot Jupiter exoplanet (10 MJup) which orbits an F6V star with an orbital period of only 0.94 days. The energy deposition and redistribution in hot Jupiter atmospheres is not well understood currently, but is a major factor for their evolution and survival. We present new results from a Spitzer campaign to observe lightcurves at 3.6-micron and 4.5-micron The minimum flux of the phase variation compared to the eclipse depth shows that the unheated hemisphere of WASP-18b is extremely dark at 3.6-micron and 4.5-micron. This suggests that the efficiency of heat distribution from the day-side to the night-side of the planet is extremely inefficient. We have also measured the amplitude, phase and shape of the phase variation in WASP-18b. We will report the results of comparing these parameters to the results of time dependent radiative models for the atmosphere of WASP-18b. This enables us to put strong constraints on the efficiency of heat redistribution in this extreme planetary system and to determine the pressure level at which the heat distribution occurs.

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