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dc.contributor.authorAhlers, John P.
dc.contributor.authorJohnson, Marshall C.
dc.contributor.authorStassun, Keivan G.
dc.contributor.authorColón, Knicole D.
dc.contributor.authorBarnes, Jason W.
dc.contributor.authorStevens, Daniel J.
dc.contributor.authorBeatty, Thomas
dc.contributor.authorGaudi, B. Scott
dc.contributor.authorCollins, Karen A.
dc.contributor.authorRodriguez, Joseph E.
dc.contributor.authorRicker, George
dc.contributor.authorVanderspek, Roland
dc.contributor.authorLatham, David
dc.contributor.authorSeager, Sara
dc.contributor.authorWinn, Joshua
dc.contributor.authorJenkins, Jon M.
dc.contributor.authorCaldwell, Douglas A.
dc.contributor.authorGoeke, Robert F.
dc.contributor.authorOsborn, Hugh P.
dc.contributor.authorPaegert, Martin
dc.contributor.authorRowden, Pam
dc.contributor.authorTenenbaum, Peter
dc.date.accessioned2020-07-13T18:24:21Z
dc.date.available2020-07-13T18:24:21Z
dc.date.issued2020-06-05
dc.identifier.citationJohn P. Ahlers et al 2020 AJ 160 4en_US
dc.identifier.issn0004-6256
dc.identifier.doi10.3847/1538-3881/ab8fa3
dc.identifier.urihttp://hdl.handle.net/10150/641834
dc.description.abstractKELT-9 b is an ultra-hot Jupiter transiting a rapidly rotating, oblate early-A-type star in a polar orbit. We model the effect of rapid stellar rotation on KELT-9 b's transit light curve using photometry from the Transiting Exoplanet Survey Satellite to constrain the planet's true spin-orbit angle and to explore how KELT-9 b may be influenced by stellar gravity darkening. We constrain the host star's equatorial radius to be 1.089 +/- 0.017 times as large as its polar radius and its local surface brightness to vary by similar to 38% between its hot poles and cooler equator. We model the stellar oblateness and surface brightness gradient and find that it causes the transit light curve to lack the usual symmetry around the time of minimum light. We take advantage of the light-curve asymmetry to constrain KELT-9 b's true spin-orbit angle (87 degrees(+10 degrees)(-11 degrees)), agreeing with Gaudi et al. that KELT-9 b is in a nearly polar orbit. We also apply a gravity-darkening correction to the spectral energy distribution model from Gaudi et al. and find that accounting for rapid rotation gives a better fit to available spectroscopy and yields a more reliable estimate for the star's polar effective temperature.en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2020. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectExoplanetsen_US
dc.subjectHot Jupitersen_US
dc.subjectExoplanet evolutionen_US
dc.subjectStellar rotationen_US
dc.subjectGravity darkeningen_US
dc.subjectvon Zeipel theoremen_US
dc.subjectExoplanet astronomyen_US
dc.subjectTransit photometryen_US
dc.titleKELT-9 b’s Asymmetric TESS Transit Caused by Rapid Stellar Rotation and Spin–Orbit Misalignmenten_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTRONOMICAL JOURNALen_US
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.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astronomical Journal
dc.source.volume160
dc.source.issue1
dc.source.beginpage4
refterms.dateFOA2020-07-13T18:24:22Z


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