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Constraints on the Atmospheric Circulation and Variability of the Eccentric Hot Jupiter XO-3b

Wong, Ian and Knutson, Heather A. and Cowan, Nicolas B. and Lewis, Nikole K. and Agol, Eric and Burrows, Adam and Deming, Drake and Fortney, Jonathan J. and Fulton, Benjamin J. and Langton, Jonathan and Laughlin, Gregory and Showman, Adam P. (2014) Constraints on the Atmospheric Circulation and Variability of the Eccentric Hot Jupiter XO-3b. Astrophysical Journal, 794 (2). Art. No. 134. ISSN 0004-637X. doi:10.1088/0004-637X/794/2/134.

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We report secondary eclipse photometry of the hot Jupiter XO-3b in the 4.5 μm band taken with the Infrared Array Camera on the Spitzer Space Telescope. We measure individual eclipse depths and center of eclipse times for a total of 12 secondary eclipses. We fit these data simultaneously with two transits observed in the same band in order to obtain a global best-fit secondary eclipse depth of 0.1580% ± 0.0036% and a center of eclipse phase of 0.67004 ± 0.00013. We assess the relative magnitude of variations in the dayside brightness of the planet by measuring the size of the residuals during ingress and egress from fitting the combined eclipse light curve with a uniform disk model and place an upper limit of 0.05%. The new secondary eclipse observations extend the total baseline from one and a half years to nearly three years, allowing us to place an upper limit on the periastron precession rate of 2.9 × 10^(–3) deg day^(–1)— the tightest constraint to date on the periastron precession rate of a hot Jupiter. We use the new transit observations to calculate improved estimates for the system properties, including an updated orbital ephemeris. We also use the large number of secondary eclipses to obtain the most stringent limits to date on the orbit-to-orbit variability of an eccentric hot Jupiter and demonstrate the consistency of multiple-epoch Spitzer observations.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wong, Ian0000-0001-9665-8429
Knutson, Heather A.0000-0002-0822-3095
Cowan, Nicolas B.0000-0001-6129-5699
Lewis, Nikole K.0000-0002-8507-1304
Agol, Eric0000-0002-0802-9145
Burrows, Adam0000-0002-3099-5024
Deming, Drake0000-0001-5727-4094
Fortney, Jonathan J.0000-0002-9843-4354
Fulton, Benjamin J.0000-0003-3504-5316
Laughlin, Gregory0000-0002-3253-2621
Additional Information:© 2014 The American Astronomical Society. Received 2014 June 27; Accepted 2014 August 25; Published 2014 October 1.
Subject Keywords:binaries: eclipsing; planetary systems; stars: individual (XO-3); techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20141113-142457698
Persistent URL:
Official Citation:Constraints on the Atmospheric Circulation and Variability of the Eccentric Hot Jupiter XO-3b Ian Wong et al. 2014 ApJ 794 134
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51721
Deposited By: Joanne McCole
Deposited On:14 Nov 2014 16:58
Last Modified:10 Nov 2021 19:15

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