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Direct Measure of Radiative and Dynamical Properties of an Exoplanet Atmosphere

de Wit, Julien and Lewis, Nikole K. and Langton, Jonathan and Laughlin, Gregory and Deming, Drake and Batygin, Konstantin and Fortney, Jonathan J. (2016) Direct Measure of Radiative and Dynamical Properties of an Exoplanet Atmosphere. Astrophysical Journal Letters, 820 (2). Art. No. L33. ISSN 2041-8205. doi:10.3847/2041-8205/820/2/L33.

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Two decades after the discovery of 51 Peg b, the formation processes and atmospheres of short-period gas giants remain poorly understood. Observations of eccentric systems provide key insights on those topics as they can illuminate how a planet's atmosphere responds to changes in incident flux. We report here the analysis of multi-day multi-channel photometry of the eccentric (e ~ 0.93) hot Jupiter HD 80606 b obtained with the Spitzer Space Telescope. The planet's extreme eccentricity combined with the long coverage and exquisite precision of new periastron-passage observations allow us to break the degeneracy between the radiative and dynamical timescales of HD 80606 b's atmosphere and constrain its global thermal response. Our analysis reveals that the atmospheric layers probed heat rapidly (~4 hr radiative timescale) from <500 to 1400 K as they absorb ~ 20% of the incoming stellar flux during the periastron passage, while the planet's rotation period is 93_(-35)^(+85) hr, which exceeds the predicted pseudo-synchronous period (40 hr).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
de Wit, Julien0000-0003-2415-2191
Lewis, Nikole K.0000-0002-8507-1304
Laughlin, Gregory0000-0002-3253-2621
Deming, Drake0000-0001-5727-4094
Batygin, Konstantin0000-0002-7094-7908
Fortney, Jonathan J.0000-0002-9843-4354
Additional Information:© 2016 The American Astronomical Society. Received 2016 January 28; accepted 2016 February 18; published 2016 March 28. J.d-W thanks the Zoweh crew for their hospitality during part of this work. 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 to NASA. Support for this work was provided by JPL/Caltech.
Funding AgencyGrant Number
Subject Keywords:methods: numerical; planet–star interactions; planets and satellites: atmospheres; planets and satellites: dynamical evolution and stability; planets and satellites: individual (HD 80606 b) ; techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20160426-142838319
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Official Citation:Julien de Wit et al 2016 ApJ 820 L33
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66487
Deposited By: Ruth Sustaita
Deposited On:26 Apr 2016 22:23
Last Modified:10 Nov 2021 23:58

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