Day-side z'-band emission and eccentricity of Wasp-12b

Details Day-side z'-band emission and eccentricity of Wasp-12b Day-side z'-band emission and eccentricity of Wasp-12b

2009-12-14

arxiv.org/abs/0912.2359v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

One more author added. Version accepted for publication on ApJL

Scientific paper

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-meter ARC 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 = 0.5100 (+0.0072,-0.0061), consistent with an orbital eccentricity of |e cos w| = 0.016 (+0.011,-0.009) (see note at 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.

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