dc.contributor.author Wang, Y. dc.contributor.author Smart, R. L. dc.contributor.author Shao, Z. dc.contributor.author Jones, H. R. A dc.contributor.author Marocco, F. dc.contributor.author Luo, A. dc.contributor.author Burgasser, A. dc.contributor.author Zhong, J. dc.contributor.author Du, B. dc.date.accessioned 2019-02-20T15:55:06Z dc.date.available 2019-02-20T15:55:06Z dc.date.issued 2018-05-14 dc.identifier.citation Wang , Y , Smart , R L , Shao , Z , Jones , H R A , Marocco , F , Luo , A , Burgasser , A , Zhong , J & Du , B 2018 , ' A focus on L dwarfs with trigonometric parallaxes ' , Publications of the Astronomical Society of the Pacific , vol. 130 , no. 988 , pp. 1-9 . https://doi.org/10.1088/1538-3873/aaacc5 dc.identifier.issn 0004-6280 dc.identifier.other PURE: 13565288 dc.identifier.other PURE UUID: 264bc606-e971-4a90-af2b-e7b4e1567c85 dc.identifier.other ArXiv: http://arxiv.org/abs/1802.02320v1 dc.identifier.other Scopus: 85049081361 dc.identifier.uri http://hdl.handle.net/2299/21123 dc.description This is an author-created, un-copyedited version of an article published in Publications of the Astronomical Society of the Pacific. Under embargo until 14 May 2019. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1538-3873/aaacc5. dc.description.abstract We report new parallax measurements for ten L and early T type dwarfs, five of which have no previous published values, using observations over 3 years at the robotic Liverpool Telescope. The resulting parallaxes and proper motions have median errors of 2\,mas and 1.5\,mas/year respectively. Their space motions indicate they are all Galactic disk members. We combined this sample with other objects with astrometry from the Liverpool Telescope and with published literature astrometry to construct a sample of 260 L and early T type dwarfs with measured parallaxes, designated the Astrometry Sample. We study the kinematics of the Astrometry Sample, and derived a solar motion of $(U,V,W)_{\bigodot} = (7.9\pm1.7,13.2\pm1.2,7.2\pm1.0)$\,\kms~ with respect to the local standard of rest, in agreement with recent literature. We derive a kinematic age of 1.5-1.7\,Gyr for the Astrometry Sample assuming the age increases monotonically with the total velocity for a given disk sample. This kinematic age is less than half literature values for other low mass dwarf samples. We believe this difference arises for two reasons (1) the sample is mainly composed of mid to late L dwarfs which are expected to be relatively young and (2) the requirement that objects have a measured parallax biases the sample to the brighter examples which tend to be younger. en dc.format.extent 9 dc.language.iso eng dc.relation.ispartof Publications of the Astronomical Society of the Pacific dc.subject astro-ph.SR dc.title A focus on L dwarfs with trigonometric parallaxes en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Centre for Astrophysics Research dc.contributor.institution School of Computer Science dc.contributor.institution Centre of Data Innovation Research dc.description.status Peer reviewed dc.date.embargoedUntil 2019-05-14 rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1088/1538-3873/aaacc5 rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true
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