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dc.contributor.authorFu, G.
dc.contributor.authorSing, D.K.
dc.contributor.authorLothringer, J.D.
dc.contributor.authorDeming, D.
dc.contributor.authorIh, J.
dc.contributor.authorKempton, E.M.-R.
dc.contributor.authorMalik, M.
dc.contributor.authorKomacek, T.D.
dc.contributor.authorMansfield, M.
dc.contributor.authorBean, J.L.
dc.date.accessioned2022-03-18T00:03:37Z
dc.date.available2022-03-18T00:03:37Z
dc.date.issued2022
dc.identifier.citationFu, G., Sing, D. K., Lothringer, J. D., Deming, D., Ih, J., Kempton, E. M.-R., Malik, M., Komacek, T. D., Mansfield, M., & Bean, J. L. (2022). Strong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation. Astrophysical Journal Letters.
dc.identifier.issn2041-8205
dc.identifier.doi10.3847/2041-8213/ac4968
dc.identifier.urihttp://hdl.handle.net/10150/663634
dc.description.abstractKnow thy star, know thy planetary atmosphere. Every exoplanet with atmospheric measurements orbits around a star, and the stellar environment directly affects the planetary atmosphere. Here we present the emission spectrum of ultra-hot Jupiter KELT-20b which provides an observational link between host-star properties and planet atmospheric thermal structure. It is currently the only planet with thermal emission measurements in the T eq ∼ 2200 K range that orbits around an early A-type star. By comparing it with other similar ultra-hot Jupiters around FGK stars, we can better understand how different host-star types influence planetary atmospheres. The emission spectrum covers 0.6-4.5 μm with data from TESS, HST WFC3/G141, and Spitzer 4.5 μm channel. KELT-20b has a 1.4 μm water feature strength metric of = -0.097 0.02 and a blackbody brightness temperature difference of 528 K between WFC3/G141 (T b = 2402 14 K) and Spitzer 4.5 μm channel (T b = 2930 59 K). These very large H2O and CO emission features combined with the A-type host star make KELT-20b a unique planet among other similar hot Jupiters. The abundant FUV, NUV, and optical radiation from its host star (Teff = 8720 250 K) is expected to be the key that drives its strong thermal inversion and prominent emission features based on previous PHOENIX model calculations. © 2022. The Author(s). Published by the American Astronomical Society..
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.rightsCopyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleStrong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation
dc.typeArticle
dc.typetext
dc.contributor.departmentSteward Observatory, University of Arizona
dc.identifier.journalAstrophysical Journal Letters
dc.description.noteOpen access article
dc.description.collectioninformationThis 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.
dc.eprint.versionFinal published version
dc.source.journaltitleAstrophysical Journal Letters
refterms.dateFOA2022-03-18T00:03:37Z


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Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.