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Secondary Eclipse Photometry of the Exoplanet WASP-5b with Warm Spitzer

Baskin, Nathaniel J. and Knutson, Heather A. and Burrows, Adam and Fortney, Jonathan J. and Lewis, Nikole K. and Agol, Eric and Charbonneau, David and Cowan, Nicolas B. and Deming, Drake and Desert, Jean-Michel and Langton, Jonathan and Laughlin, Gregory and Showman, Adam P. (2013) Secondary Eclipse Photometry of the Exoplanet WASP-5b with Warm Spitzer. Astrophysical Journal, 773 (2). Art. No. 124. ISSN 0004-637X.

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We present secondary eclipse photometry of the extrasolar planet WASP-5b taken in the 3.6 and 4.5 μm bands with the Spitzer Space Telescope's Infrared Array Camera as part of the extended warm mission. By estimating the depth of the secondary eclipse in these two bands we can place constraints on the planet's atmospheric pressure-temperature profile and chemistry. We measure secondary eclipse depths of 0.197% ± 0.028% and 0.237% ± 0.024% in the 3.6 μm and 4.5 μm bands, respectively. For the case of a solar-composition atmosphere and chemistry in local thermal equilibrium, our observations are best matched by models showing a hot dayside and, depending on our choice of model, a weak thermal inversion or no inversion at all. We measure a mean offset from the predicted center of eclipse of 3.7 ± 1.8 minutes, corresponding to ecos ω = 0.0025 ± 0.0012 and consistent with a circular orbit. We conclude that the planet's orbit is unlikely to have been perturbed by interactions with another body in the system as claimed by Fukui et al.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Knutson, Heather A.0000-0002-0822-3095
Burrows, Adam0000-0002-3099-5024
Fortney, Jonathan J.0000-0002-9843-4354
Lewis, Nikole K.0000-0002-8507-1304
Agol, Eric0000-0002-0802-9145
Charbonneau, David0000-0002-9003-484X
Cowan, Nicolas B.0000-0001-6129-5699
Deming, Drake0000-0001-5727-4094
Desert, Jean-Michel0000-0002-0875-8401
Laughlin, Gregory0000-0002-3253-2621
Additional Information:© 2013 American Astronomical Society. Received 2013 March 14, accepted for publication 2013 July 3. Published 2013 August 1.
Subject Keywords: eclipses; planetary systems; techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20130722-092340344
Persistent URL:
Official Citation:Secondary Eclipse Photometry of the Exoplanet WASP-5b with Warm Spitzer Nathaniel J. Baskin et al. 2013 ApJ 773 124
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39485
Deposited By: Tony Diaz
Deposited On:19 Aug 2013 20:55
Last Modified:09 Mar 2020 13:18

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