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Title:
Discovery of the benchmark metal-poor T8 dwarf BD +01° 2920B
Authors:
Pinfield, D. J.; Burningham, B.; Lodieu, N.; Leggett, S. K.; Tinney, C. G.; van Spaandonk, L.; Marocco, F.; Smart, R.; Gomes, J.; Smith, L.; Lucas, P. W.; Day-Jones, A. C.; Murray, D. N.; Katsiyannis, A. C.; Catalan, S.; Cardoso, C.; Clarke, J. R. A.; Folkes, S.; Gálvez-Ortiz, M. C.; Homeier, D.; Jenkins, J. S.; Jones, H. R. A.; Zhang, Z. H.
Affiliation:
AA(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AB(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AC(Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Tenerife, Spain), AD(Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720, USA), AE(Department of Astrophysics, School of Physics, University of New South Wales, NSW 2052, Australia), AF(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AG(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AH(Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Torino, Strada Osservatrio 20, 10025 Pino Torinese, Italy), AI(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AJ(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AK(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AL(Universidad de Chile, Santiago, Casilla 36-D, Chile), AM(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AN(Institute of Astronomy & Astrophysics, National Observatory of Athens, Penteli GR-15236, Greece), AO(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AP(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB; Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Torino, Strada Osservatrio 20, 10025 Pino Torinese, Italy; Astrophysics Group, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QL), AQ(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AR(Departamento de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Casilla 5030, Valparaíso, Chile), AS(Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain), AT(CRAL, UMR 5574, CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cédex 07, France), AU(Universidad de Chile, Santiago, Casilla 36-D, Chile), AV(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AW(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 3, pp. 1922-1932. (MNRAS Homepage)
Publication Date:
05/2012
Origin:
WILEY
Astronomy Keywords:
surveys, brown dwarfs, stars: low-mass
Abstract Copyright:
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
DOI:
10.1111/j.1365-2966.2012.20549.x
Bibliographic Code:
2012MNRAS.422.1922P

Abstract

We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10 000 au) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H] =-0.38 ± 0.06) primary BD +01° 2920 (HIP 70319), a G1 dwarf at a distance of 17.2 pc. This new benchmark has Teff= 680 ± 55 K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well-determined metallicity of its companion, the properties of BD +01° 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J075003.84+272544.8.
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