First T dwarfs in the VISTA Hemisphere Survey
First T dwarfs in the VISTA Hemisphere Survey
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VISTA 半球巡天中的第一颗 T 矮星
DOI:
10.1051/0004-6361/201220182
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发表时间:
2012
影响因子:
6.5
通讯作者:
Lodieu N
中科院分区:
文献类型:
--
作者:
Lodieu N
AimsThe aim of the project is to improve our current knowledge of the density of T dwarfs and the shape of the substellar initial mass function by identifying a magnitude-limited sample of T dwarfs in the full southern sky.MethodsWe present the results of a photometric search aimed at discovering cool brown dwarfs in the southern sky imaged at infrared wavelengths by the Visible and Infrared Survey Telescope for Astronomy (VISTA) and the Wide Infrared Survey Explorer (WISE) satellite mission. We combined the first data release (DR1) of the VISTA Hemisphere Survey (VHS) and the WISE preliminary data release to extract candidates with red mid-infrared colours and near- to mid-infrared colours characteristics of cool brown dwarfs.ResultsThe VHS DR1 vs. WISE search returned tens of T dwarf candidates, 13 of which are presented here, including two previously published in the literature and five new ones confirmed spectroscopically with spectral types between T4.5 and T8. We estimate that the two T6 dwarfs lie within 16 pc and the T4.5 within 25 pc. The remaining three are 30–50 pc distant. The only T7 dwarf in our sample is the faintest of its spectral class withJ= 19.28 mag. The other six T dwarf candidates remain without spectroscopic follow-up. We also improve our knowledge on the proper motion accuracy for three bright T dwarfs by combining multi-epoch data from public databases (DENIS, 2MASS, VHS, WISE,Spitzer).
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DOI:
10.1086/501431
发表时间:
2006-01
期刊:
The Astronomical Journal
影响因子:
--
作者:
K. Chiu;X. Fan;S. Leggett;D. Golimowski;W. Zheng;T. Geballe;D. Schneider;J. Brinkmann
通讯作者:
K. Chiu;X. Fan;S. Leggett;D. Golimowski;W. Zheng;T. Geballe;D. Schneider;J. Brinkmann
DOI:
10.1088/0004-637x/726/1/30
发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Mainzer;M. Cushing;M. Skrutskie;C. Gelino;J. Kirkpatrick;Thomas H. Jarrett;F. Masci;M. Marley;D. Saumon;E. Wright;Rachael L. Beaton;M. Dietrich;P. Eisenhardt;P. Garnavich;O. Kuhn;D. Leisawitz;K. Marsh;Ian S. McLean;D. Padgett;Katherine Rueff
通讯作者:
Katherine Rueff
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
L. Albert;É. Artigau;P. Delorme;C. Reylé;T. Forveille;X. Delfosse;C. Willott
通讯作者:
C. Willott
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
J. Faherty;A. Burgasser;F. Walter;N. S. van der Bliek;M. Shara;K. Cruz;A. West;F. Vrba;G. Anglada
通讯作者:
G. Anglada
DOI:
10.1086/498563
发表时间:
2005-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Burgasser;T. Geballe;S. Leggett;J. Kirkpatrick;D. Golimowski
通讯作者:
A. Burgasser;T. Geballe;S. Leggett;J. Kirkpatrick;D. Golimowski