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

Abstract

We present photometry of the extrasolar planet WASP-5b in the 3.6 and 4.5 micron bands taken with the Spitzer Space Telescope's Infrared Array Camera as part of the extended warm mission. By examining the depth of the planet's secondary eclipse at these two wavelengths, we can place joint constraints on the planet's atmospheric pressure-temperature profile and chemistry. We measure secondary eclipse depths of 0.197% +/- 0.028% and 0.227% +/- 0.025% in the 3.6 micron and 4.5 micron bands, respectively. 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 0.078 +/- 0.032 hours, translating to ecos(omega) = 0.0031 +/- 0.0013 and consistent with a circular orbit. We see no evidence for any eclipse timing variations comparable to those reported in a previous transit study.

5 pages, 5 figures, ApJ in press

References in corpus (11)

• Detection of Thermal Emission from an Extrasolar Planet
• Can TiO Explain Thermal Inversions in the Upper Atmospheres of Irradiated Giant Planets?
• Atmospheric Sulfur Photochemistry on Hot Jupiters
• Theoretical Spectra and Light Curves of Close-in Extrasolar Giant Planets and Comparison with Data
• Orbital Phase Variations of the Eccentric Giant Planet HAT-P-2b
• Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b
• Thermal Emission of Exoplanet XO-1b
• On the Presence of Water and Global Circulation in the Transiting Planet HD 189733b
• Accurate spectroscopic parameters of WASP planet host stars
• The Transit Light Curve (TLC) Project. II. Two Transits of the Exoplanet OGLE-TR-111b
• WASP-5b: a dense, very-hot Jupiter transiting a 12th-mag Southern-hemisphere star

Cited by in corpus (23)

• Near-IR Direct Detection of Water Vapor in Tau Boo b
• Features in the Broadband Eclipse Spectra of Exoplanets: Signal or Noise?
• Statistical Characterization of Hot Jupiter Atmospheres using Spitzer's Secondary Eclipses
• A transition between the hot and the ultra-hot Jupiter atmospheres
• Systematic Phase Curve Study of Known Transiting Systems from Year 1 of the TESS Mission
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope
• Spitzer and z' Secondary Eclipse Observations of the Highly Irradiated Transiting Brown Dwarf KELT-1b
• The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
• Evidence for disequilibrium chemistry from vertical mixing in hot Jupiter atmospheres. A comprehensive survey of transiting close-in gas giant exoplanets with warm-Spitzer/IRAC
• Warm Spitzer and Palomar Near-IR Secondary Eclipse Photometry of Two Hot Jupiters: WASP-48b and HAT-P-23b
• Colour-magnitude diagrams of transiting Exoplanets - II. A larger sample from photometric distances
• The TROY project: Searching for co-orbital bodies to known planets. I. Project goals and first results from archival radial velocity
• The test case of HD26965: difficulties disentangling weak Doppler signals from stellar activity
• Observational Signatures of Self-Destructive Civilisations
• Using helium 10830 Å transits to constrain planetary magnetic fields
• Characterization of Exoplanets: Secondary Eclipses
• The secondary transit of the hot Jupiter WASP-121b at 2 $\mu$m
• Ground-based detection of the near-infrared emission from the dayside of WASP-5b
• Trends in Spitzer Secondary Eclipses
• Colour-colour and colour-magnitude diagrams for Hot Jupiters
• Reassessing Exoplanet Light Curves with a Thermal Model
• Near infrared and optical emission of WASP-5 b