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Title:
76 T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density
Authors:
Burningham, Ben; Cardoso, C. V.; Smith, L.; Leggett, S. K.; Smart, R. L.; Mann, A. W.; Dhital, S.; Lucas, P. W.; Tinney, C. G.; Pinfield, D. J.; Zhang, Z.; Morley, C.; Saumon, D.; Aller, K.; Littlefair, S. P.; Homeier, D.; Lodieu, N.; Deacon, N.; Marley, M. S.; van Spaandonk, L.; Baker, D.; Allard, F.; Andrei, A. H.; Canty, J.; Clarke, J.; Day-Jones, A. C.; Dupuy, T.; Fortney, J. J.; Gomes, J.; Ishii, M.; Jones, H. R. A.; Liu, M.; Magazzú, A.; Marocco, F.; Murray, D. N.; Rojas-Ayala, B.; Tamura, M.
Affiliation:
AA(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK; Observatório Nacional, Rua General José Cristino, 77 - São Cristóvão, Rio de Janeiro - RJ 20921-400, Brazil; ), AB(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK; Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, Italy), AC(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AD(Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720, USA), AE(Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, Italy), AF(Institute for Astronomy, University of Hawai`i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AG(Department of Astronomy, Boston University, 725 Commonwealth Ave, Boston, MA 02215, USA), AH(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AI(Australian Centre for Astrobiology, University of New South Wales, NSW 2052, Australia; School of Physics, University of New South Wales, NSW 2052, Australia), AJ(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AK(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AL(Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA), AM(Los Alamos National Laboratory, PO Box 1663, MS F663, Los Alamos, NM 87545, USA), AN(Institute for Astronomy, University of Hawai`i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AO(Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK), AP(Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, D-37077 Gottingen, Germany; C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France), AQ(Instituto de Astrofísica de Canarias (IAC), Calle Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain; Instituto de Astrofísica de Canarias, E-38200 La Laguna, Spain), AR(Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg, Germany), AS(NASA Ames Research Center, Mail Stop 245-3, Moffett Field, CA 94035, USA), AT(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AU(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AV(C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France), AW(Observatório Nacional, Rua General José Cristino, 77 - São Cristóvão, Rio de Janeiro - RJ 20921-400, Brazil; Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, Italy; Shanghai Astronomical Observatory/CAS, 80 Nandan Road, Shanghia 200030, China; Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, Rio de Janeiro - RJ 20080-090, Brazil), AX(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AY(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), AZ(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK; Universidad de Chile, Camino el Observatorio # 1515, Santiago, Casilla 36-D, Chile), BA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA), BB(Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA), BC(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), BD(Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720, USA), BE(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), BF(Institute for Astronomy, University of Hawai`i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), BG(Fundación Galileo Galilei - INAF, Apartado 565, E-38700 Santa Cruz de La Palma, Spain), BH(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), BI(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK), BJ(Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA), BK(National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 433, Issue 1, p.457-497 (MNRAS Homepage)
Publication Date:
07/2013
Origin:
OUP
Astronomy Keywords:
surveys, brown dwarfs, stars: low-mass
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stt740
Bibliographic Code:
2013MNRAS.433..457B

Abstract

We report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Near-infrared broad- and narrow-band photometry and spectroscopy are presented for the new objects, along with Wide-field Infrared Survey Explorer (WISE) and warm-Spitzer photometry. Proper motions for 128 UKIDSS T dwarfs are presented from a new two epoch LAS proper motion catalogue. We use these motions to identify two new benchmark systems: LHS 6176AB, a T8p+M4 pair and HD 118865AB, a T5.5+F8 pair. Using age constraints from the primaries and evolutionary models to constrain the radii, we have estimated their physical properties from their bolometric luminosity. We compare the colours and properties of known benchmark T dwarfs to the latest model atmospheres and draw two principal conclusions. First, it appears that the H - [4.5] and J - W2 colours are more sensitive to metallicity than has previously been recognized, such that differences in metallicity may dominate over differences in Teff when considering relative properties of cool objects using these colours. Secondly, the previously noted apparent dominance of young objects in the late-T dwarf sample is no longer apparent when using the new model grids and the expanded sample of late-T dwarfs and benchmarks. This is supported by the apparently similar distribution of late-T dwarfs and earlier type T dwarfs on reduced proper motion diagrams that we present. Finally, we present updated space densities for the late-T dwarfs, and compare our values to simulation predictions and those from WISE.
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