%0 Generic %1 best2020hawaii %A Best, William M. J. %A Liu, Michael C. %A Magnier, Eugene A. %A Dupuy, Trent J. %D 2020 %K astrometry %R 10.3847/1538-3881/ab84f4 %T The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT %U http://arxiv.org/abs/2010.15850 %X We present parallaxes, proper motions, and $J$-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope. This is the largest single batch of infrared parallaxes for brown dwarfs to date. Our parallaxes have a median uncertainty of 3.5 mas, similar to most previous ground-based infrared parallax surveys. Our target list was designed to complete a volume-limited parallax sample of L0-T8 dwarfs out to 25 pc spanning declinations $-30^\circ$ to $+60^\circ$ (68% of the sky). We report the first parallaxes for 165 objects, and we improve on previous measurements for another 53 objects. Our targets include 104 objects (mostly early-L dwarfs) having $Gaia$ DR2 parallax measurements, with which our parallaxes are consistent. We include an extensive comparison of previous literature parallaxes for L and T dwarfs with both our results and $Gaia$ DR2 measurements, identifying systematic offsets for some previous surveys. Our parallaxes confirm that 14 objects previously identified as wide common proper motion companions to main-sequence stars have distances consistent with companionship. We also report new $J_MKO$ photometry for our targets, including the first measurements for 193 of our targets and improvements over previously published $J_MKO$ photometry for another 60 targets. Altogether, our parallaxes will enable the first population studies using a volume-limited sample spanning spectral types L0-T8 defined entirely by parallaxes.

@misc{best2020hawaii, abstract = {We present parallaxes, proper motions, and $J$-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope. This is the largest single batch of infrared parallaxes for brown dwarfs to date. Our parallaxes have a median uncertainty of 3.5 mas, similar to most previous ground-based infrared parallax surveys. Our target list was designed to complete a volume-limited parallax sample of L0-T8 dwarfs out to 25 pc spanning declinations $-30^\circ$ to $+60^\circ$ (68% of the sky). We report the first parallaxes for 165 objects, and we improve on previous measurements for another 53 objects. Our targets include 104 objects (mostly early-L dwarfs) having $Gaia$ DR2 parallax measurements, with which our parallaxes are consistent. We include an extensive comparison of previous literature parallaxes for L and T dwarfs with both our results and $Gaia$ DR2 measurements, identifying systematic offsets for some previous surveys. Our parallaxes confirm that 14 objects previously identified as wide common proper motion companions to main-sequence stars have distances consistent with companionship. We also report new $J_\mathrm{MKO}$ photometry for our targets, including the first measurements for 193 of our targets and improvements over previously published $J_\mathrm{MKO}$ photometry for another 60 targets. Altogether, our parallaxes will enable the first population studies using a volume-limited sample spanning spectral types L0-T8 defined entirely by parallaxes.}, added-at = {2020-11-04T16:42:08.000+0100}, author = {Best, William M. J. and Liu, Michael C. and Magnier, Eugene A. and Dupuy, Trent J.}, biburl = {https://www.bibsonomy.org/bibtex/2eb675d7a09055841ad55148f94d7e624/superjenwinters}, description = {The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT}, doi = {10.3847/1538-3881/ab84f4}, interhash = {b93f501f5f8cc64c542e9c44a33a1833}, intrahash = {eb675d7a09055841ad55148f94d7e624}, keywords = {astrometry}, note = {cite arxiv:2010.15850Comment: Published in AJ. 54 pages, 17 figures, 7 tables. Data for all parallax survey targets can be found in the UltracoolSheet at http://bit.ly/UltracoolSheet , a compilation of 3000+ ultracool dwarfs and imaged exoplanets, including photometry, J2000 positions, parallaxes, proper motions, multiplicity, and spectroscopic classifications from multiple surveys and numerous sources}, timestamp = {2020-11-04T16:42:08.000+0100}, title = {The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT}, url = {http://arxiv.org/abs/2010.15850}, year = 2020 }