Day-side z’-band emission and eccentricity of Wasp-12b
Coughlin, Jeffrey L.
Sing, David K.
Rogers, Justin C.
Spiegel, David S.
Adams, Elisabeth R.
Letters of the Astrophysical Journal
IOP Publishing for American Astronomical Society
We report the detection of the eclipse of the very hot Jupiter WASP-12b via z -band time-series photometry obtained with the 3.5 m Astrophysical Research Consortium telescope at Apache Point Observatory. We measure a decrease in flux of 0.082% ± 0.015% during the passage of the planet behind the star. That planetary flux is equally well reproduced by atmospheric models with and without extra absorbers, and blackbody models with f 0.585 ± 0.080. It is therefore necessary to measure the planet at other wavelengths to further constrain its atmospheric properties. The eclipse appears centered at phase φ = 0.5100+0.0072 −0.0061, consistent with an orbital eccentricity of |e cos ω| = 0.016+0.011 −0.009 (see note at the end of Section 4). If the orbit of the planet is indeed eccentric, the large radius of WASP-12b can be explained by tidal heating.
NSF - Graduate Research Fellowship
STScI Director's Discretionary Research Fund
Copyright © 2010 IOP Publishing / American Astronomical Society
Vol. 716 (1), pp. L36-L40