Day-side z′-band emission and eccentricity of wasp-12b

Mercedes López-Morales, Jeffrey L. Coughlin, David K. Sing, Adam S. Burrows, Dniel Apai, Justin C. Rogers, David S. Spiegel, Elisabeth R. Adams

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63 Scopus citations


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 |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.

Original languageEnglish (US)
Pages (from-to)L36-L40
JournalAstrophysical Journal Letters
Issue number1 PART 2
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Stars: individual (WASP-12)
  • Techniques: photometric


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