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    Phase Curves of WASP-33b and HD 149026b and a New Correlation between Phase Curve Offset and Irradiation Temperature

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    Zhang_2018_AJ_155_83.pdf
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    Author
    Zhang, Michael cc
    Knutson, Heather A.
    Kataria, T. cc
    Schwartz, Joel C. cc
    Cowan, Nicolas B. cc
    Showman, Adam P.
    Burrows, Adam cc
    Fortney, Jonathan J. cc
    Todorov, Kamen cc
    Desert, Jean-Michel cc
    Agol, Eric cc
    Deming, Drake
    Show allShow less
    Affiliation
    Univ Arizona, Dept Planetary Sci
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2018-01-24
    Keywords
    astrochemistry
    magnetohydrodynamics (MHD)
    methods: data analysis
    planetary systems
    planets and satellites: atmospheres
    planets and satellites: individual (HD 149026b, WASP-33b)
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Phase Curves of WASP-33b and HD 149026b and a New Correlation between Phase Curve Offset and Irradiation Temperature 2018, 155 (2):83 The Astronomical Journal
    Journal
    The Astronomical Journal
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present new 3.6 and 4.5 mu m Spitzer phase curves for the highly irradiated hot Jupiter WASP-33b and the unusually dense Saturn-mass planet HD 149026b. As part of this analysis, we develop a new variant of pixel-level decorrelation that is effective at removing intrapixel sensitivity variations for long observations (>10 hr) where the position of the star can vary by a significant fraction of a pixel. Using this algorithm, we measure eclipse depths, phase amplitudes, and phase offsets for both planets at 3.6 and 4.5 mu m. We use a simple toy model to show that WASP-33b's phase offset, albedo, and heat recirculation efficiency are largely similar to those of other hot Jupiters despite its very high irradiation. On the other hand, our fits for HD 149026b prefer a very high albedo. We also compare our results to predictions from general circulation models, and we find that while neither planet matches the models well, the discrepancies for HD 149026b are especially large. We speculate that this may be related to its high bulk metallicity, which could lead to enhanced atmospheric opacities and the formation of reflective cloud layers in localized regions of the atmosphere. We then place these two planets in a broader context by exploring relationships between the temperatures, albedos, heat transport efficiencies, and phase offsets of all planets with published thermal phase curves. We find a striking relationship between phase offset and irradiation temperature: the former drops with increasing temperature until around 3400 K and rises thereafter. Although some aspects of this trend are mirrored in the circulation models, there are notable differences that provide important clues for future modeling efforts.
    ISSN
    1538-3881
    DOI
    10.3847/1538-3881/aaa458
    Version
    Final published version
    Sponsors
    NASA; Sloan Foundation
    Additional Links
    http://stacks.iop.org/1538-3881/155/i=2/a=83?key=crossref.dfd28c700cf003259f7f563ae7809983
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/aaa458
    Scopus Count
    Collections
    UA Faculty Publications

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