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dc.contributor.authorCañas, Caleb I.
dc.contributor.authorBender, Chad
dc.contributor.authorMahadevan, Suvrath
dc.contributor.authorFleming, Scott W.
dc.contributor.authorBeatty, Thomas G.
dc.contributor.authorCovey, Kevin R.
dc.contributor.authorLee, Nathan De
dc.contributor.authorHearty, Fred R.
dc.contributor.authorGarcía-Hernández, D. A.
dc.contributor.authorMajewski, Steven R.
dc.contributor.authorSchneider, Donald P.
dc.contributor.authorStassun, Keivan G.
dc.contributor.authorWilson, Robert F.
dc.date.accessioned2018-09-04T16:50:36Z
dc.date.available2018-09-04T16:50:36Z
dc.date.issued2018-07-01
dc.identifier.citationCaleb I. Cañas et al 2018 ApJL 861 L4en_US
dc.identifier.issn2041-8213
dc.identifier.doi10.3847/2041-8213/aacbc5
dc.identifier.urihttp://hdl.handle.net/10150/628629
dc.description.abstractUsing spectroscopic radial velocities with the Apache Point Observatory Galaxy Evolution Experiment (APOGEE) instrument and Gaia distance estimates, we demonstrate that Kepler-503b, currently considered a validated Kepler planet, is in fact a brown-dwarf/low-mass star in a nearly circular 7.2-day orbit around a subgiant star. Using a mass estimate for the primary star derived from stellar models, we derive a companion mass and radius of 0.075 +/- 0.003 M-circle dot (78.6 +/- 3.1 M-Jup) and 0.099(-0.004)(+0.006) R-circle dot(0.966(-0.04)(+0.06) R-Jup), respectively. Assuming that the system is coeval, the evolutionary state of the primary indicates the age is similar to 6.7 Gyr. Kepler-503b sits right at the hydrogenburning mass limit, straddling the boundary between brown dwarfs and very low-mass stars. More precise radial velocities and secondary eclipse spectroscopy with the James Webb Space Telescope (JWST) will provide improved measurements of the physical parameters and age of this important system to better constrain and understand the physics of these objects and their spectra. This system emphasizes the value of radial velocity observations to distinguish a genuine planet from astrophysical false positives, and is the first result from the Sloan Digital Sky Survey (SDSS)-IV monitoring of Kepler planet candidates with the multi-object APOGEE instrument.en_US
dc.description.sponsorshipNSF [AST 1517592, 1616684, 1616636]; Spanish Ministry of Economy and Competitiveness (MINECO) [AYA-2017-88254-P]; NASA [NAS5-26555]; NASA Office of Space Science [NNX09AF08G]; NASA; NSF; NASA Science Mission directorate; Alfred P. Sloan Foundation; U.S. Department of Energy Office of Science; University of Utah; Brazilian Participation Group; Carnegie Institution for Science; Carnegie Mellon University; Chilean Participation Group; French Participation Group; Harvard-Smithsonian Center for Astrophysics; Instituto de Astroffsica de Canarias; Johns Hopkins University; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo; Lawrence Berkeley National Laboratory; Leibniz Institut fur Astrophysik Potsdam (AIP); Max-Planck-Institut fur Astronomic (MPIA Heidelberg); Max-Planck-Institut fur Astrophysik (MPA Garching); Max-Planck-Institut fur Extraterrestrische Physik (MPE); National Astronomical Observatories of China; New Mexico State University; New York University; University of Notre Dame; Observatario Nacional/MCTI; Ohio State University; Pennsylvania State University; Shanghai Astronomical Observatory; United Kingdom Participation Group; Universidad Nacional Autonoma de Mexico; University of Arizona; University of Colorado Boulder; University of Oxford; University of Portsmouth; University of Virginia; University of Washington; University of Wisconsin; Vanderbilt University; Yale Universityen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/2041-8205/861/i=1/a=L4?key=crossref.1d8ad6830ce886fc3e3002b12068f4d3en_US
dc.rights© 2018. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectbinaries: eclipsingen_US
dc.subjectstars: low-massen_US
dc.subjecttechniques: photometricen_US
dc.subjecttechniques: spectroscopicen_US
dc.titleKepler-503b: An Object at the Hydrogen Burning Mass Limit Orbiting a Subgiant Staren_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.identifier.journalASTROPHYSICAL JOURNAL LETTERSen_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 Astrophysical Journal
dc.source.volume861
dc.source.issue1
dc.source.beginpageL4
refterms.dateFOA2018-09-04T16:50:37Z


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