Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 20, 2013 | Submitted + Published
Journal Article Open

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


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.

Additional Information

© 2013 American Astronomical Society. Received 2013 March 14, accepted for publication 2013 July 3. Published 2013 August 1.

Attached Files

Published - 0004-637X_773_2_124.pdf

Submitted - 1303.3886v2.pdf


Files (783.3 kB)
Name Size Download all
433.2 kB Preview Download
350.1 kB Preview Download

Additional details

August 22, 2023
February 2, 2024