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dc.contributor.authorForbrich, Jan
dc.contributor.authorDupuy, Trent J.
dc.contributor.authorReid, Mark Jonathan
dc.contributor.authorBerger, Edo
dc.contributor.authorRizzuto, Aaron
dc.contributor.authorMann, Andrew W.
dc.contributor.authorLiu, Michael C.
dc.contributor.authorAller, Kimberly
dc.contributor.authorKraus, Adam L.
dc.date.accessioned2017-03-03T21:58:02Z
dc.date.issued2016
dc.identifier.citationForbrich, Jan, Trent J. Dupuy, Mark J. Reid, Edo Berger, Aaron Rizzuto, Andrew W. Mann, Michael C. Liu, Kimberly Aller, and Adam L. Kraus. 2016. High-Precision Radio and Infrared Astrometry of Lspm J1314+1320ab. I. Parallax, Proper Motions, and Limits on Planets. The Astrophysical Journal 827, no. 1: 22. doi:10.3847/0004-637x/827/1/22.en_US
dc.identifier.issn1538-4357en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30510191
dc.description.abstractWe present multi-epoch astrometric radio observations with the Very Long Baseline Array (VLBA) of the young ultracool-dwarf binary LSPM J1314+1320AB . The radio emission comes from the secondary star. Combining the VLBA data with Keck near-infrared adaptive-optics observations of both components, a full astrometric fit of parallax (πabs = 57.975 ± 0.045 mas, corresponding to a distance of d = 17.249 ± 0.013 pc), proper motion (µαcosδ = −247.99 ± 0.10 mas yr−1 , µδ = −183.58 ± 0.22 mas yr−1 ), and orbital motion is obtained. Despite the fact that the two components have nearly identical masses to within ±2%, the secondary’s radio emission exceeds that of the primary by a factor of &30, suggesting a difference in stellar rotation history, which could result in different magnetic field configurations. Alternatively, the emission could be anisotropic and beamed toward us for the secondary but not for the primary. Using only reflex motion, we exclude planets of mass 0.7 to 10 Mjup with orbital periods of 600 to 10 days, respectively. Additionally, we use the full orbital solution of the binary to derive an upper limit for the semi-major axis of 0.23 AU for stable planetary orbits within this system. These limits cover a parameter space that is inaccessible with, and complementary to, near-infrared radial velocity surveys of ultracool dwarfs. Our absolute astrometry will constitute an important test for the astrometric calibration of Gaia.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherAmerican Astronomical Societyen_US
dc.relation.isversionofdoi:10.3847/0004-637x/827/1/22en_US
dc.relation.hasversionhttps://arxiv.org/abs/1605.07177en_US
dash.licenseOAP
dc.subjectstars: low-massen_US
dc.subjectstars: individual LSPM J1314+1320en_US
dc.subjectradio continuum: starsen_US
dc.subjecttechniques: high angular resolutionen_US
dc.subjectbinaries: generalen_US
dc.titleHigh-Precision Radio and Infrared Astrometry of Lspm J1314+1320ab. I. Parallax, Proper Motions, and Limits on Planetsen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorBerger, Edo
dc.date.available2017-03-03T21:58:02Z
dc.identifier.doi10.3847/0004-637x/827/1/22*
dash.contributor.affiliatedReid, Mark
dash.contributor.affiliatedBerger, Edo


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