Nymeyer, Sarah, Harrington, J. (Joseph), Hardy, Ryan A., Stevenson, Kevin B., Campo, Christopher J., Madhusudhan, Nikku, Collier-Cameron, Andrew, Loredo, Thomas J., Blecic, Jasmina, Bowman, William C., Britt, Christopher B. T., Cubillos, Patricio, Hellier, Coel, Gillon, Michael, Maxted, P. F. L., Hebb, L., Wheatley, Peter J., Pollacco, Don and Anderson, D. R.. (2011) Spitzer secondary eclipses of WASP-18b. Astrophysical Journal, Vol.742 (No.1). Article: 35. ISSN 0004-637X

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Abstract

The transiting exoplanet WASP-18b was discovered in 2008 by the Wide Angle Search for Planets project. The Spitzer Exoplanet Target of Opportunity Program observed secondary eclipses of WASP-18b using Spitzer's Infrared Array Camera in the 3.6 mu m and 5.8 mu m bands on 2008 December 20, and in the 4.5 mu m and 8.0 mu m bands on 2008 December 24. We report eclipse depths of 0.30% +/- 0.02%, 0.39% +/- 0.02%, 0.37% +/- 0.03%, 0.41% +/- 0.02%, and brightness temperatures of 3100 +/- 90, 3310 +/- 130, 3080 +/- 140, and 3120 +/- 110 K in order of increasing wavelength. WASP-18b is one of the hottest planets yet discovered-as hot as an M-class star. The planet's pressure-temperature profile most likely features a thermal inversion. The observations also require WASP-18b to have near-zero albedo and almost no redistribution of energy from the day side to the night side of the planet.

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Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Planets -- Atmospheres, Satellites -- Atmospheres, Planets -- Spectra, Infrared astronomy, Astronomical spectroscopy
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	2011
Volume:	Vol.742
Number:	No.1
Page Range:	Article: 35
Identification Number:	10.1088/0004-637X/742/1/35
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration (NASA)
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URI:	http://wrap.warwick.ac.uk/id/eprint/40316

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