2012A&A...548A..53L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST04:57:34

2012A&A...548A..53L - Astronomy and Astrophysics, volume 548A, 53-53 (2012/12-1)

First T dwarfs in the VISTA Hemisphere Survey.

LODIEU N., BURNINGHAM B., DAY-JONES A., SCHOLZ R.-D., MAROCCO F., KOPOSOV S., BARRADO Y NAVASCUES D., LUCAS P.W., CRUZ P., LILLO J., JONES H., PEREZ-GARRIDO A., RUIZ M.T., PINFIELD D., REBOLO R., BEJAR V.J.S., BOUDREAULT S., EMERSON J.P., BANERJI M., GONZALEZ-SOLARES E., HODGKIN S.T., McMAHON R., CANTY J. and CONTRERAS C.

Abstract (from CDS):

The 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. We 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. The 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 16pc and the T4.5 within 25pc. The remaining three are 30-50pc distant. The only T7 dwarf in our sample is the faintest of its spectral class with J=19.28mag. 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).

Abstract Copyright:

Journal keyword(s): brown dwarfs - stars: low-mass - techniques: photometric - techniques: spectroscopic - infrared: stars - surveys

Nomenclature: Table 1: [LBD2012] JHHMMSS.ss+DDMMSS.s N=13. Figs 3-4, Table 2: VHS JHHMMSS.ss+DDMMSS.s N=5.

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 WISE J023756.27-063143.1 BD? 02 37 56.266 -06 31 42.88           ~ 1 0
2 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 147 0
3 WISE J051859.66-544902.8 BD? 05 18 59.665 -54 49 02.85           ~ 1 0
4 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 461 0
5 PG 0918+029 HS* 09 21 28.2141418281 +02 46 02.253964445 11.975 13.056 13.327 13.456 13.615 sdB1VIIHe6 100 0
6 WISE J122148.50-433214.9 BD? 12 21 48.501 -43 32 14.91           ~ 1 0
7 WISE J125804.90-441232.5 BD* 12 58 04.904 -44 12 32.53           T6.0 1 0
8 WISE J132547.13-434042.3 BD? 13 25 47.139 -43 40 42.32           ~ 1 0
9 ULAS J134940.81+091833.3 BD* 13 49 40.81296 +09 18 33.4836           T7 4 0
10 WISE J143311.42-083736.4 BD* 14 33 11.421 -08 37 36.48           T8.0 4 0
11 2MASS J15031961+2525196 BD* 15 03 19.6105599007 +25 25 19.773297519           T5.5 54 0
12 CFBDS J150411+102717 BD* 15 04 11.72688 +10 27 16.9128           T7.0 22 0
13 PG 1528+062 HS* 15 30 49.9257698452 +06 00 56.279611967 13.424 14.515 14.767 14.878 15.063 sdOB 28 0
14 WISE J154352.78-043909.5 BD* 15 43 52.83336 -04 39 09.3384           T4.5 4 0
15 EGGR 118 WD* 16 17 55.2413312245 -15 35 52.151811413 12.086 13.215 13.425 13.558 13.714 DA1.7 84 0
16 WISE J162208.93-095934.4 BD* 16 22 08.87376 -09 59 35.2896           T6 5 0
17 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 131 0
18 WISE J164235.38-093018.0 BD? 16 42 35.384 -09 30 18.02           ~ 1 0
19 WISE J192934.18-442550.5 BD* 19 29 34.186 -44 25 50.58           T4.0 1 0
20 WISE J195550.11-441514.3 BD? 19 55 50.113 -44 15 14.33           ~ 1 0
21 WISE J205159.29-550845.3 BD* 20 51 59.298 -55 08 45.33           T7.0 1 0
22 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 58 0

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2020.08.09-04:57:34

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