Day-side z’-band emission and eccentricity of Wasp-12b
Lopez-Morales, M.; Coughlin, Jeffrey L.; Sing, David K.; et al.Burrows, A.S.; Apai, Daniel; Rogers, Justin C.; Spiegel, David S.; Adams, Elisabeth R.
Date: 20 May 2010
Journal
Letters of the Astrophysical Journal
Publisher
IOP Publishing for American Astronomical Society
Publisher DOI
Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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