2012MNRAS.422.1922P

Query : 2012MNRAS.422.1922P

2012MNRAS.422.1922P - Mon. Not. R. Astron. Soc., 422, 1922-1932 (2012/May-3)

Discovery of the benchmark metal-poor T8 dwarf BD +01° 2920B.

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., GALVEZ-ORTIZ M.C., HOMEIER D., JENKINS J.S., JONES H.R.A. and ZHANG Z.H.

Abstract (from CDS):

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.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): surveys - brown dwarfs - stars: low-mass

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 182 0
2 HD 63433 MS* 07 49 55.0606576176 +27 21 47.457467316   7.59 6.91     G5V 206 0
3 ULAS J075003.88+272545.4 BD* 07 50 03.44160 +27 25 43.2840           T8.5 15 0
4 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 69 0
5 BD+13 2618C BD* 13 00 42.0799 +12 21 14.800         23.28 T8.5p 153 0
6 HD 113879 SB* 13 06 35.8983647328 +15 22 26.304793320   9.95 9.43     F5V 25 0
7 ULAS J141623.94+134836.3 BD* 14 16 23.94216 +13 48 36.3204           T7.5p 64 0
8 HD 126053 PM* 14 23 15.2847745835 +01 14 29.641269692 6.98 6.90 6.27 5.71 5.39 G1.5V 442 0
9 HD 126053B BD* 14 23 20.79 +01 16 38.2           T8 32 0
10 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
11 HD 131976 ** 14 57 26.53330 -21 24 41.5778 10.759 9.559 8.065 7.075 9.02 M1.5V 265 1
12 HD 131977 BY* 14 57 28.0007918772 -21 24 55.727265310 7.89 6.83 5.72 4.74 4.19 K4V 525 0
13 BD+06 2986 PM* 15 04 53.5261634600 +05 38 17.160679455 12.262 11.13 9.815 8.998 8.257 K8V 107 0
14 BD+06 2986B BD* 15 04 57.390096 +05 37 57.41508         23.85 sdT5.5 26 0
15 WISE J154151.65-225024.9 BD* 15 41 52.28912 -22 50 24.7060           Y0 59 0
16 CoRoT-3 EB* 19 28 13.2642131544 +00 07 18.613986132   14.199 13.292 13.099 12.54 F3V 86 1
17 CoRoT-3b Pl 19 28 13.2642131544 +00 07 18.613986132           ~ 148 1
18 Kepler-39b Pl 19 47 50.4745594512 +46 02 03.499726272           ~ 73 1

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