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dc.contributor.authorWilcomb, Kielan K.
dc.contributor.authorKonopacky, Quinn M.
dc.contributor.authorBarman, Travis S.
dc.contributor.authorTheissen, Christopher A.
dc.contributor.authorRuffio, Jean-Baptiste
dc.contributor.authorBrock, Laci
dc.contributor.authorMacintosh, Bruce
dc.contributor.authorMarois, Christian
dc.date.accessioned2021-01-13T02:54:20Z
dc.date.available2021-01-13T02:54:20Z
dc.date.issued2020-10-15
dc.identifier.citationWilcomb, K. K., Konopacky, Q. M., Barman, T. S., Theissen, C. A., Ruffio, J. B., Brock, L., ... & Marois, C. (2020). Moderate-resolution K-band Spectroscopy of Substellar Companion κ Andromedae b. The Astronomical Journal, 160(5), 207.en_US
dc.identifier.issn0004-6256
dc.identifier.doi10.3847/1538-3881/abb9b1
dc.identifier.urihttp://hdl.handle.net/10150/650752
dc.description.abstractWe present moderate-resolution (R similar to 4000) K-band spectra of the "super-Jupiter,"kappa Andromedae b. The data were taken with the OSIRIS integral field spectrograph at Keck Observatory. The spectra reveal resolved molecular lines from H2O and CO, and are compared to a custom PHOENIX atmosphere model grid appropriate for young planetary-mass objects. We fit the data using a Markov chain Monte Carlo forward-modeling method. Using a combination of our moderate-resolution spectrum and low-resolution, broadband data from the literature, we derive an effective temperature of T-eff = 1950-2150 K, a surface gravity of log g = 3.5-4.5, and a metallicity of [M/H] = -0.2-0.0. These values are consistent with previous estimates from atmospheric modeling and the currently favored young age of the system (<50 Myr). We derive a C/O ratio of 0.70(-0.24)(+0.09) for the source, broadly consistent with the solar C/O ratio. This, coupled with the slightly subsolar metallicity, implies a composition consistent with that of the host star, and is suggestive of formation by a rapid process. The subsolar metallicity of kappa Andromedae b is also consistent with predictions of formation via gravitational instability. Further constraints on formation of the companion will require measurement of the C/O ratio of kappa Andromedae A. We also measure the radial velocity of kappa Andromedae b for the first time, with a value of -1.4 +/- 0.9 km s(-1) relative to the host star. We find that the derived radial velocity is consistent with the estimated high eccentricity of kappa Andromedae b.en_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rights© 2020. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://iopscience.iop.org/info/page/text-and-data-miningen_US
dc.titleModerate-resolution K-band Spectroscopy of Substellar Companion κ Andromedae ben_US
dc.typeArticleen_US
dc.identifier.eissn1538-3881
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_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.issue5
dc.source.beginpage207
refterms.dateFOA2021-01-13T02:54:32Z


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