Spitzer Secondary Eclipses of WASP-18b

Nymeyer, Sarah; Harrington, Joseph; Hardy, Ryan A; Stevenson, Kevin B; Campo, Christopher J; Madhusudhan, Nikku; Collier-Cameron, Andrew; Blecic, Jasmina; Bowman, William C; Britt, Christopher B T; Cubillos, Patricio; Hellier, Coel; Gillon, Michaël; Maxted, Pierre F L; Hebb, Leslie; Wheatley, Peter J; Pollacco, Don; Anderson, David

doi:10.1088/0004-637X/742/1/35

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Spitzer Secondary Eclipses of WASP-18b

Nymeyer, Sarah; Harrington, Joseph; Hardy, Ryan A et al.

2011 • In Astrophysical Journal, 742 (1), p. 35

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https://hdl.handle.net/2268/60743

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10.1088/0004-637X/742/1/35

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Keywords :

Astrophysics - Earth and Planetary Astrophysics

Abstract :

[en] The transiting exoplanet WASP-18b was discovered in 2008 by the Wide Angle Search for Planets (WASP) project. The Spitzer Exoplanet Target of Opportunity Program observed secondary eclipses of WASP-18b using Spitzer's Infrared Array Camera (IRAC) in the 3.6-micron and 5.8-micron bands on 2008 December 20, and in the 4.5-micron and 8.0-micron bands on 2008 December 24. We report eclipse depths of 0.31+-0.02, 0.38+-0.03, 0.41+-0.02, 0.43+-0.03 %, and brightness temperatures of 2920 +- 90, 3150 +- 130, 3040 +- 130 and 2960 +- 130 K, respectively. WASP-18b is one of the hottest planets yet discovered - as hot as an M-class star. The planet's pressure-temperature profile 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Nymeyer, Sarah

Harrington, Joseph

Hardy, Ryan A

Stevenson, Kevin B

Campo, Christopher J

Madhusudhan, Nikku

Collier-Cameron, Andrew

Blecic, Jasmina

Bowman, William C

Britt, Christopher B T

More authors (8 more)

Language :

English

Title :

Spitzer Secondary Eclipses of WASP-18b

Publication date :

01 November 2011

Journal title :

Astrophysical Journal

ISSN :

0004-637X

eISSN :

1538-4357

Publisher :

University of Chicago Press, Chicago, United States - Illinois

Volume :

742

Issue :

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2010arXiv1005.1017N

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