Show simple item record

dc.contributor.authorForbrich, Jan
dc.contributor.authorDupuy, Trent J.
dc.contributor.authorReid, Mark J.
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.accessioned2017-05-26T10:26:18Z
dc.date.available2017-05-26T10:26:18Z
dc.date.issued2016-08-03
dc.identifier.citationForbrich , J , Dupuy , T J , Reid , M J , Berger , E , Rizzuto , A , Mann , A W , Liu , M C , Aller , K & Kraus , A L 2016 , ' High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - I : Parallax, Proper Motions, and Limits on Planets ' , The Astrophysical Journal , vol. 827 , no. 1 . https://doi.org/10.3847/0004-637X/827/1/22
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 11211925
dc.identifier.otherPURE UUID: b26a3611-d1c1-441c-8857-506bb5c3d697
dc.identifier.otherArXiv: http://arxiv.org/abs/1605.07177v1
dc.identifier.otherScopus: 84982090924
dc.identifier.urihttp://hdl.handle.net/2299/18223
dc.descriptionJan Forbrich, et al, 'HIGH-PRECISION RADIO AND INFRARED ASTROMETRY OF LSPM J1314+1320AB. I.PARALLAX, PROPER MOTIONS, AND LIMITS ON PLANETS', The Astrophysical Journal, 827:22 (8pp), August 2016. doi:10.3847/0004-637X/827/1/22. © 2016. The American Astronomical Society. All rights reserved.
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 ($\pi_{\rm abs}=57.975\pm0.045$ mas, corresponding to a distance of $d=17.249\pm0.013$ pc), proper motion ($\mu_{\rm \alpha cos \delta}=-247.99\pm0.10$ mas yr$^{-1}$, $\mu_{\delta}=-183.58\pm0.22$ mas yr$^{-1}$), and orbital motion is obtained. Despite the fact that the two components have nearly identical masses to within $\pm2$%, the secondary's radio emission exceeds that of the primary by a factor of $\gtrsim$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 $M_{\rm jup}$ 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
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.subjectbinaries: general
dc.subjectradio-continuum: stars
dc.subjectstars: individual (LSPM J1314+1320)
dc.subjectstars: low-mass
dc.subjecttechniques: high angular resolution
dc.titleHigh-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - I : Parallax, Proper Motions, and Limits on Planetsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2016-08-03
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.3847/0004-637X/827/1/22
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record