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The thermal emission of the exoplanet WASP-3b

Rostron, John W. and Wheatley, Peter J. and Anderson, David R. and Collier Cameron, Andrew and Fortney, Jonathan J. and Harrington, Joseph and Knutson, Heather A. and Pollacco, Don L. (2014) The thermal emission of the exoplanet WASP-3b. Monthly Notices of the Royal Astronomical Society, 441 (4). pp. 3666-3678. ISSN 0035-8711.

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We report the detection of thermal emission from the transiting hot Jupiter WASP-3b at 3.6, 4.5 and 8.0 μm using the Spitzer Space Telescope. We obtain planet-to-star flux ratios of 0.209^(+0.040)_(−0.028), 0.282 ± 0.012 and 0.328^(+0.086)_(−0.055)  per cent at these wavelengths, respectively, implying infrared brightness temperatures of T_(3.6μm) =2280^(+210)_(−150) K , T_(4.5 μm) = 2400 ± 80 K and T_(8.0μm) =2210^(+390)_(−250) K . We find that WASP-3b falls into an emerging class of highly irradiated planets whose measured temperatures suggest that the planets are dark and redistribute heat around the planet inefficiently. The latter is similarly concluded from 1D atmospheric model comparisons, which also favour the presence of an atmospheric temperature inversion. We compare the WASP-3 system to the proposed inversion–activity relation, finding that it hints at a more complex relation than a simple cut-off in activity implied by previous data. Using eclipse timings we also constrain e cos ω to be −0.0006^(+0.0010)_(−0.0006), suggesting that the eccentricity of WASP-3b can only be large for a narrow range of ω.

Item Type:Article
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URLURL TypeDescription DOIArticle
Wheatley, Peter J.0000-0003-1452-2240
Collier Cameron, Andrew0000-0002-8863-7828
Fortney, Jonathan J.0000-0002-9843-4354
Knutson, Heather A.0000-0002-0822-3095
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 April 23. Received 2014 April 14; in original form 2014 January 19. JWR acknowledges financial support from the Warwick Postgraduate Research Scholarship scheme. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Astrophysics at Warwick is supported by an STFC grant.
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Science and Technology Facilities Council (STFC)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20140807-085637142
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48168
Deposited By: Jason Perez
Deposited On:07 Aug 2014 22:17
Last Modified:09 Mar 2020 13:18

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