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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Affiliation
Univ Arizona, Lunar & Planetary LabIssue Date
2020-06-02Keywords
ExoplanetsHot Jupiters
Exoplanet atmospheres
Exoplanet atmospheric composition
Planetary atmospheres
Near infrared astronomy
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IOP PUBLISHING LTDCitation
Joshua D. Lothringer and Travis S. Barman 2020 AJ 159 289Journal
ASTRONOMICAL JOURNALRights
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
0004-6256Version
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/ab8d33