Constraints on the atmospheric circulation and variability of the eccentric hot Jupiter Xo-3b
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Wong-2014-CONSTRAINTS ON THE A.pdf
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Author(s)
Wong, Ian
Knutson, Heather A.
Cowan, Nicolas B.
Agol, Eric
Burrows, Adam
Deming, Drake
Fortney, Jonathan J.
Fulton, Benjamin J.
Langton, Jonathan
Laughlin, Gregory
Date Issued
October 2014
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Wong, Ian, Heather A. Knutson, Nicolas B. Cowan, Nikole K. Lewis, Eric Agol, Adam Burrows, Drake Deming, et al. “Constraints on the Atmospheric Circulation and Variability of the Eccentric Hot Jupiter Xo-3b.” The Astrophysical Journal 794, no. 2 (October 1, 2014): 134. © 2014 The American Astronomical Society
Version
Final published version
Abstract
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[superscript –3] deg day[superscript –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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1088/0004-637x/794/2/134
