2012AJ....144..180M

Query : 2012AJ....144..180M

2012AJ....144..180M - Astron. J., 144, 180 (2012/December-0)

Discovery of two very wide binaries with ultracool companions and a new brown dwarf at the L/T transition.

MUZIC K., RADIGAN J., JAYAWARDHANA R., IVANOV V.D., FAHERTY J.K., KURTEV R.G., NUNEZ A., BOFFIN H.M.J., HAINAUT O., CRUZ K., JONES D., METCHEV S., TYNDALL A. and BORISSOVA J.

Abstract (from CDS):

We present the discovery and spectroscopic follow-up of a nearby late-type L dwarf (2M0614+3950), and two extremely wide very low mass binary systems (2M0525-7425AB and 2M1348-1344AB), resulting from our search for common proper motion pairs containing ultracool components in the Two Micron All Sky Survey and the Wide-field Infrared Survey Explorer catalogs. The near-infrared spectrum of 2M0614+3950 indicates a spectral type L9±1 object residing at a distance of 26.0±1.8 pc. The optical spectrum of 2M0525-7425A reveals an M3.0 ± 0.5 dwarf primary, accompanied by a secondary previously classified as L2. The system has an angular separation of ∼44'', equivalent to ∼2000 AU at a distance of 46.0±3.0 pc. Using optical and infrared spectra, respectively, we classify the components of 2M1348-1344AB as M4.5±0.5 and T5.5±1. The angular separation of ∼68'' is equivalent to ∼1400 AU at a distance of 20.7 ±1.4 pc. 2M1348-1344AB is one of only six very wide (separation >1000 AU) systems containing late T dwarfs known to date.

Abstract Copyright: ∼

Journal keyword(s): binaries: general - brown dwarfs - stars: individual (2MASS J06143818+3950357, 2MASS J05254550-7425263, 2MASS J05253876-7426008, 2MASS J13480721-1344321, 2MASS J13480290-1344071) - stars: low-mass

CDS comments: Wide binaries 2M1348-1344A and 2M0525-7425A are not in Simbad.

Simbad objects: 26

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Number of rows : 26
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 L 362-29 PM* 00 04 36.4375346731 -40 44 02.880162313   14.47 12.84 12.525   M4V 88 0
2 G 2-26 PM* 01 11 36.6654241032 +12 05 07.032826392   13.89 12.30 11.91   M0V 24 0
3 DENIS J025503.3-470049 BD* 02 55 03.6927058871 -47 00 51.356903955     22.921 19.906 17.454 L9 170 0
4 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 182 0
5 2MASS J05253876-7426008 BD* 05 25 38.8538064621 -74 26 00.510887362           L2 6 0
6 AL 189 Em* 05 25 45.5592476799 -74 25 26.025056683       13.07   M 18 0
7 2MASS J06143791+3951202 NIR 06 14 37.9042272240 +39 51 20.205524196           ~ 1 0
8 2MASS J06143818+3950357 BD* 06 14 38.186 +39 50 35.76           L9 7 0
9 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 104 0
10 SDSS J120747.17+024424.8 BD* 12 07 47.17392 +02 44 24.9288           L6.5+T2.5 73 0
11 LP 908-41 PM* 12 17 30.1686735936 -29 02 20.790417524   18.1 16.901 15.700 14.050 M4.0V 12 0
12 BD+13 2618C BD* 13 00 42.0799 +12 21 14.800         23.28 T8.5p 153 0
13 WT 392 PM* 13 13 09.3281149697 -41 30 39.740475153   14.0       M5 23 0
14 LP 738-14 B BD* 13 48 02.90808 -13 44 07.1664           T5.5 15 0
15 LP 738-14 PM* 13 48 07.2760635189 -13 44 31.599383701   16.79 15.07 14.90 12.054 M4.5 26 0
16 L 763-63 LM* 13 59 10.4109747299 -19 50 03.655217606   14.558 12.88 11.60 9.90 M4.5V 80 0
17 WT 460 ** 14 11 59.8993078070 -41 32 21.916525001       15.355   M5.5e 28 0
18 HD 126146 * 14 24 22.5850011072 -26 45 31.609234224   8.35 8.30     A0V 13 0
19 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
20 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 84 0
21 BD+06 2986B BD* 15 04 57.390096 +05 37 57.41508         23.85 sdT5.5 26 0
22 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
23 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 145 0
24 G 204-39B BD* 17 58 05.45496 +46 33 09.9108           T7 51 1
25 * eps Ind B BD* 22 04 10.5951812451 -56 46 58.239102418     24.12 20.8 15.60 T1V+T6V 176 1
26 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 80 0

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