SPITZER SECONDARY ECLIPSES OF WASP-18b
- Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, FL 32816-2385 (United States)
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
- School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS (United Kingdom)
- Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853-6801 (United States)
- Astrophysics Group, Keele University, Staffordshire ST5 5BG (United Kingdom)
- Institut d'Astrophysique et de Geophysique, Universite de Liege, Allee du 6 Aout 17, Bat. B5C, 4000 Liege (Belgium)
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)
- Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
- Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN (United Kingdom)
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.
- OSTI ID:
- 21612608
- Journal Information:
- Astrophysical Journal, Vol. 742, Issue 1; Other Information: DOI: 10.1088/0004-637X/742/1/35; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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