CaltechAUTHORS
Published August 20, 2013 | Version Submitted + Published
Journal Article Open

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

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Princeton University
  • 3. ROR icon University of California, Santa Cruz
  • 4. ROR icon Massachusetts Institute of Technology
  • 5. ROR icon University of Washington
  • 6. ROR icon Harvard-Smithsonian Center for Astrophysics
  • 7. ROR icon Northwestern University
  • 8. ROR icon University of Maryland, College Park
  • 9. ROR icon Principia College
  • 10. ROR icon University of Arizona

Abstract

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

0004-637X_773_2_124.pdf

Files (783.3 kB)

Name Size
md5:0617f2af44ae66060f444308f57f8c92
433.2 kB Preview Download
md5:2bc6304a0e2d3feadd92024a72db5a6a
350.1 kB Preview Download

Additional details

Identifiers

Eprint ID
39485
Resolver ID
CaltechAUTHORS:20130722-092340344

Related works

Describes
http://arxiv.org/abs/1303.3886 (URL)

Dates

Created
2013-08-19
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Division of Geological and Planetary Sciences (GPS)