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dc.contributor.authorDupuy, Trent J.
dc.contributor.authorBrandt, Timothy D.
dc.contributor.authorKratter, Kaitlin M.
dc.contributor.authorBowler, Brendan P.
dc.date.accessioned2019-05-23T23:54:13Z
dc.date.available2019-05-23T23:54:13Z
dc.date.issued2019-01-20
dc.identifier.citationTrent J. Dupuy et al 2019 ApJL 871 L4en_US
dc.identifier.issn2041-8213
dc.identifier.doi10.3847/2041-8213/aafb31
dc.identifier.urihttp://hdl.handle.net/10150/632398
dc.description.abstractWe use a cross-calibration of Hipparcos and Gaia. second data release astrometry for beta Pic to measure the mass of the giant planet beta Pic. b (13 +/- 3 M-Jup) in a comprehensive joint orbit analysis that includes published relative astrometry and radial velocities. Our mass uncertainty is somewhat higher than previous work because our astrometry from the Hipparcos-Gaia Catalog of Accelerations accounts for the error inflation and systematic terms that are required to bring the two data. sets onto a common astrometric reference frame, and because we fit freely for the host-star mass (1.84 +/- 0.05 M-circle dot). This first model-independent mass for a directly imaged planet is inconsistent with cold-start models given the age of the beta Pic moving group (22 +/- 6 Myr) but consistent with hot and warm-start models, concordant with past work. We find a higher eccentricity (0.24 +/- 0.06) for beta Pic b compared to previous orbital fits. If confirmed by future observations, this eccentricity may help explain inner edge, scale height, and brightness asymmetry of beta Pic's disk. It could also potentially signal that beta Pic b has migrated inward to its current location, acquiring its eccentricity from interaction with the 3:1 outer Lindblad resonance in the disk.en_US
dc.description.sponsorshipGemini Observatory; Heising-Simons Foundationen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/2041-8205/871/i=1/a=L4?key=crossref.4aa35925f1e63da5f1713694bac2924fen_US
dc.rights© 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectastrometryen_US
dc.subjectplanetary systemsen_US
dc.subjectstars: individual (bet Pic)en_US
dc.titleA Model-independent Mass and Moderate Eccentricity for beta Pic ben_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.contributor.departmentUniv Arizona, Steward Observen_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.volume871
dc.source.issue1
dc.source.beginpageL4
refterms.dateFOA2019-05-23T23:54:13Z


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