Authors

S. Nymeyer; J. Harrington; R. A. Hardy; K. B. Stevenson; C. J. Campo; N. Madhusudhan; A. Collier-Cameron; T. J. Loredo; J. Blecic; W. C. Bowman; C. B. T. Britt; P. Cubillos; C. Hellier; M. Gillon; P. F. L. Maxted; L. Hebb; P. J. Wheatley; D. Pollacco;D. R. Anderson

Comments

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Abbreviated Journal Title

Astrophys. J.

Keywords

infrared: planetary systems; planets and satellites: atmospheres; planets and satellites: composition; planets and satellites: individual; (WASP-18b); INFRARED-EMISSION SPECTRUM; IRRADIATED GIANT PLANETS; TRANSIT; LIGHT-CURVE; HOT JUPITERS; HD 209458B; TEMPERATURE INVERSION; EXTRASOLAR; PLANET; THERMAL EMISSION; EXOPLANET WASP-12B; GJ 436B; Astronomy & Astrophysics

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.

Journal Title

Astrophysical Journal

Volume

742

Issue/Number

1

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

11

WOS Identifier

WOS:000296783400035

ISSN

0004-637X

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