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Warm Spitzer and Palomar Near-IR Secondary Eclipse Photometry of Two Hot Jupiters: WASP-48b and HAT-P-23b

O'Rourke, Joseph G. and Knutson, Heather A. and Zhao, Ming and Fortney, Jonathan J. and Burrows, Adam and Agol, Eric and Deming, Drake and Désert, Jean-Michel and Howard, Andrew W. and Lewis, Nikole K. and Showman, Adam P. and Todorov, Kamen O. (2014) Warm Spitzer and Palomar Near-IR Secondary Eclipse Photometry of Two Hot Jupiters: WASP-48b and HAT-P-23b. Astrophysical Journal, 781 (2). Art. No. 109. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20131016-135111981

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Abstract

We report secondary eclipse photometry of two hot Jupiters, WASP-48b and HAT-P-23b, at 3.6 and 4.5 μm taken with the InfraRed Array Camera aboard the Spitzer Space Telescope during the warm Spitzer mission and in the H and K_S bands with the Wide Field IR Camera at the Palomar 200 inch Hale Telescope. WASP-48b and HAT-P-23b are Jupiter-mass and twice Jupiter-mass objects orbiting an old, slightly evolved F star and an early G dwarf star, respectively. In the H, K_S , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.047% ± 0.016%, 0.109% ± 0.027%, 0.176% ± 0.013%, and 0.214% ± 0.020% for WASP-48b. In the K_S , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.234% ± 0.046%, 0.248% ± 0.019%, and 0.309% ± 0.026% for HAT-P-23b. For WASP-48b and HAT-P-23b, respectively, we measure delays of 2.6 ± 3.9 minutes and 4.0 ± 2.4 minutes relative to the predicted times of secondary eclipse for circular orbits, placing 2σ upper limits on |ecos ω| of 0.0053 and 0.0080, both of which are consistent with circular orbits. The dayside emission spectra of these planets are well-described by blackbodies with effective temperatures of 2158 ± 100 K (WASP-48b) and 2154 ± 90 K (HAT-P-23b), corresponding to moderate recirculation in the zero albedo case. Our measured eclipse depths are also consistent with one-dimensional radiative transfer models featuring varying degrees of recirculation and weak thermal inversions or no inversions at all. We discuss how the absence of strong temperature inversions on these planets may be related to the activity levels and metallicities of their host stars.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1310.0011arXivDiscussion Paper
http://iopscience.iop.org/0004-637X/781/2/109PublisherArticle
http://dx.doi.org/10.1088/0004-637X/781/2/109DOIArticle
ORCID:
AuthorORCID
O'Rourke, Joseph G.0000-0002-1180-996X
Knutson, Heather A.0000-0002-0822-3095
Zhao, Ming0000-0002-4258-9517
Fortney, Jonathan J.0000-0002-9843-4354
Burrows, Adam0000-0002-3099-5024
Agol, Eric0000-0002-0802-9145
Deming, Drake0000-0001-5727-4094
Désert, Jean-Michel0000-0002-0875-8401
Howard, Andrew W.0000-0001-8638-0320
Lewis, Nikole K.0000-0002-8507-1304
Todorov, Kamen O.0000-0002-9276-8118
Additional Information:© 2014 American Astronomical Society. Received 2013 September 29; accepted 2013 December 10; published 2014 January 15. J.G.O. receives support from the National Science Foundation’s Graduate Research Fellowship Program and thanks Michael Line for many helpful discussions. J.-M.D. acknowledges funding from NASA through the Sagan Exoplanet Fellowship program administered by the NASA Exoplanet Science Institute (NExScI). M.Z. is supported by the Center for Exoplanets and Habitable Worlds at Penn State University, and the AAS Small Research Grant. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. The Palomar Hale Telescope is operated by Caltech, JPL, and Cornell University.
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
NASA Sagan FellowshipUNSPECIFIED
Penn State University Center for Exoplanets and Habitable WorldsUNSPECIFIED
American Astronomical SocietyUNSPECIFIED
Subject Keywords: eclipses; planetary systems; stars: individual (WASP-48, HAT-P-23); techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20131016-135111981
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131016-135111981
Official Citation:Warm Spitzer and Palomar Near-IR Secondary Eclipse Photometry of Two Hot Jupiters: WASP-48b and HAT-P-23b. Joseph G. O'Rourke et al. 2014 ApJ 781 109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41954
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Oct 2013 21:04
Last Modified:09 Mar 2020 13:18

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