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    The PHOENIX Exoplanet Retrieval Algorithm and Using H− Opacity as a Probe in Ultrahot Jupiters

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    Lothringer_2020_AJ_159_289.pdf
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    Author
    Lothringer, Joshua D. cc
    Barman, Travis S. cc
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2020-06-02
    Keywords
    Exoplanets
    Hot Jupiters
    Exoplanet atmospheres
    Exoplanet atmospheric composition
    Planetary atmospheres
    Near infrared astronomy
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Joshua D. Lothringer and Travis S. Barman 2020 AJ 159 289
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    Copyright © 2020. 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
    Atmospheric retrievals are now a standard tool to analyze observations of exoplanet atmospheres. This data-driven approach quantitatively compares atmospheric models to observations in order to estimate atmospheric properties and their uncertainties. In this paper, we introduce a new retrieval package, the PHOENIX Exoplanet Retrieval Algorithm (PETRA). PETRA places the PHOENIX atmosphere model in a retrieval framework, allowing us to combine the strengths of a well-tested and widely-used atmosphere model with the advantages of retrieval algorithms. We validate PETRA by retrieving on simulated data for which the true atmospheric state is known. We also show that PETRA can successfully reproduce results from previously published retrievals of WASP-43b and HD 209458b. For the WASP-43b results, we show the effect that different line lists and line profile treatments have on the retrieved atmospheric properties. Lastly, we describe a novel technique for retrieving the temperature structure and e(-) density in ultrahot Jupiters using H- opacity, allowing us to probe atmospheres devoid of most molecular features with the James Webb Space Telescope.
    ISSN
    0004-6256
    DOI
    10.3847/1538-3881/ab8d33
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/ab8d33
    Scopus Count
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    UA Faculty Publications

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