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Evaluating Climate Variability of the Canonical Hot-Jupiters HD 189733b and HD 209458b through Multi-epoch Eclipse Observations

Kilpatrick, Brian M. and Kataria, Tiffany and Lewis, Nikole K. and Zellem, Robert T. and Henry, Gregory W. and Cowan, Nicolas B. and de Wit, Julien and Fortney, Jonathan J. and Knutson, Heather and Seager, Sara and Showman, Adam P. and Tucker, Gregory S. (2020) Evaluating Climate Variability of the Canonical Hot-Jupiters HD 189733b and HD 209458b through Multi-epoch Eclipse Observations. Astronomical Journal, 159 (2). Art. No. 51. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20200402-083204689

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Abstract

Here we present the analysis of multi-epoch secondary eclipse observations of HD 189733b and HD 209458b as a probe of temporal variability in the planetary climate using both Spitzer channels 1 and 2 (3.6 and 4.5 μm). We expect hot-Jupiter atmospheres to be dynamic environments exhibiting time varying weather. However, it is uncertain to what extent temporal variability will be observable when considering disk integrated observations. We do not detect statistically significant variability and are able to place useful upper limits on the infrared variability amplitudes in these atmospheres. There are very few planets with multi-epoch observations at the required precision to probe variability in dayside emission. The observations considered in this study span several years, providing insight into temporal variability at multiple timescales. In the case of HD 189733b, the best-fit eclipse depths for the channel 2 observations exhibit a scatter of 102 ppm about a median depth of 1827 ppm and in channel 1 exhibit a scatter of 88 ppm about a median depth of 1481 ppm. For HD 209458b, the best-fit eclipse depths for the channel 2 observations exhibit a scatter of 22 ppm about a median depth of 1406 ppm, and in channel 1 exhibit a scatter of 131 ppm about a median depth of 1092 ppm. The precision and scatter in these observations allow us to constrain variability to less than (5.6% and 6.0%) and (12% and 1.6%) for channels (1, 2) of HD 189733b and HD 209458b, respectively.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab6223DOIArticle
https://arxiv.org/abs/1904.02294arXivDiscussion Paper
ORCID:
AuthorORCID
Kilpatrick, Brian M.0000-0003-4220-600X
Kataria, Tiffany0000-0003-3759-9080
Lewis, Nikole K.0000-0002-8507-1304
Zellem, Robert T.0000-0001-7547-0398
Henry, Gregory W.0000-0003-4155-8513
Cowan, Nicolas B.0000-0001-6129-5699
de Wit, Julien0000-0003-2415-2191
Fortney, Jonathan J.0000-0002-9843-4354
Knutson, Heather0000-0002-0822-3095
Seager, Sara0000-0002-6892-6948
Tucker, Gregory S.0000-0002-6954-6947
Additional Information:© 2020 The American Astronomical Society. Received 2019 April 3; revised 2019 November 18; accepted 2019 December 14; published 2020 January 16. This work was supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program under grant No. 80NSSC17K0484. 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 a contract with NASA. We also acknowledge that part of this work was completed at the Space Telescope Science Institute (STScI) operated by AURA, Inc. This research has made use of the Exoplanet Orbit Database and the Exoplanet Data Explorer at exoplanets.org.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NASA Earth and Space Science Fellowship80NSSC17K0484
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:Exoplanet atmospheres ; Exoplanet atmospheric variability ; Exoplanet astronomy ; Exoplanet structure
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanet atmospheres (487); Exoplanet atmospheric variability (2020); Exoplanet astronomy (486); Exoplanet structure (495)
Record Number:CaltechAUTHORS:20200402-083204689
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200402-083204689
Official Citation:Brian M. Kilpatrick et al 2020 AJ 159 51
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102258
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Apr 2020 15:51
Last Modified:02 Apr 2020 15:51

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