Size comparison of WASP-12b (gray) with Jupiter.

Title: Day-side z'-band Emission and Eccentricity of WASP-12b
Authors: López-Morales, Mercedes; Coughlin, Jeffrey L.; Sing, David K.; Burrows, Adam; Apai, Dániel; Rogers, Justin C.; Spiegel, David S.; Adams, Elisabeth R.
Affiliation: AA(Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road NW, Washington, DC 20015, USA ; Hubble Fellow. ; mercedes@dtm.ciw.edu), AB(Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA ; NSF Graduate Research Fellow.), AC(Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter, Ex4 4QL, UK ), AD(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA ), AE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AF(Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road NW, Washington, DC 20015, USA ; Department of Physics and Astronomy, The Johns Hopkins University, 366 Bloomberg Center, 3400 North Charles Street, Baltimore, MD 21218, USA ), AG(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA ), AH(Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA )
Publication: The Astrophysical Journal Letters, Volume 716, Issue 1, pp. L36-L40 (2010). (ApJL Homepage)
Publication Date: 06/2010
Origin: IOP
ApJ Keywords:
planetary systems, stars: individual: WASP-12, techniques: photometric
DOI: 10.1088/2041-8205/716/1/L36
Bibliographic Code: 2010ApJ...716L..36L

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 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 phi = 0.5100+0.0072 –0.0061, consistent with an orbital eccentricity of |ecos 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.

Based on observations collected with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium (ARC).
http://adsabs.harvard.edu/abs/2010ApJ...716L..36L