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dc.contributor.authorJacobs, B.
dc.contributor.authorDésert, J.-M.
dc.contributor.authorPino, L.
dc.contributor.authorLine, M.R.
dc.contributor.authorBean, J.L.
dc.contributor.authorKhorshid, N.
dc.contributor.authorSchlawin, E.
dc.contributor.authorArcangeli, J.
dc.contributor.authorBarat, S.
dc.contributor.authorHoeijmakers, H.J.
dc.contributor.authorKomacek, T.D.
dc.contributor.authorMansfield, M.
dc.contributor.authorParmentier, V.
dc.contributor.authorThorngren, D.
dc.date.accessioned2024-01-24T05:44:45Z
dc.date.available2024-01-24T05:44:45Z
dc.date.issued2022-11-30
dc.identifier.citationJacobs, B., Désert, J. M., Pino, L., Line, M. R., Bean, J. L., Khorshid, N., ... & Thorngren, D. (2022). A strong H-opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b. arXiv preprint arXiv:2211.10297.
dc.identifier.issn0004-6361
dc.identifier.doi10.1051/0004-6361/202244533
dc.identifier.urihttp://hdl.handle.net/10150/670689
dc.description.abstractWe present the analysis of a spectroscopic secondary eclipse of the hottest transiting exoplanet detected to date, KELT-9b, obtained with the Wide Field Camera 3 aboard the Hubble Space Telescope. We complement these data with literature information on stellar pulsations and Spitzer/Infrared Array Camera and Transiting Exoplanet Survey Satellite eclipse depths of this target to obtain a broadband thermal emission spectrum. Our extracted spectrum exhibits a clear turnoff at 1.4 μm. This points to H- bound-free opacities shaping the spectrum. To interpret the spectrum, we perform grid retrievals of self-consistent 1D equilibrium chemistry forward models, varying the composition and energy budget. The model with solar metallicity and C/O ratio provides a poor fit because the H- signal is stronger than expected, requiring an excess of electrons. This pushes our retrievals toward high atmospheric metallicities ([M/H] = 1.98-0.21+0.19) and a C/O ratio that is subsolar by 2.4σ. We question the viability of forming such a high-metallicity planet, and therefore provide other scenarios to increase the electron density in this atmosphere. We also look at an alternative model in which we quench TiO and VO. This fit results in an atmosphere with a slightly subsolar metallicity and subsolar C/O ratio ([M/H] = -0.22-0.13+0.17, log (C/O) = -0.34-0.34+0.19). However, the required TiO abundances are disputed by recent high-resolution measurements of the same planet. © 2022 EDP Sciences. All rights reserved.
dc.language.isoen
dc.publisherEDP Sciences
dc.rights© B. Jacobs et al. 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectPlanets and satellites: atmospheres
dc.subjectPlanets and satellites: gaseous planets
dc.titleA strong H-opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b
dc.typeArticle
dc.typetext
dc.contributor.departmentSteward Observatory, The University of Arizona
dc.identifier.journalAstronomy and Astrophysics
dc.description.noteOpen access journal
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.journaltitleAstronomy and Astrophysics
refterms.dateFOA2024-01-24T05:44:45Z


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© B. Jacobs et al. 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.
Except where otherwise noted, this item's license is described as © B. Jacobs et al. 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.