2017ApJ...843L...4B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST03:43:08

2017ApJ...843L...4B - Astrophys. J., 843, L4-L4 (2017/July-1)

The young L dwarf 2MASS J11193254-1137466 is a planetary-mass binary.

BEST W.M.J., LIU M.C., DUPUY T.J. and MAGNIER E.A.

Abstract (from CDS):

We have discovered that the extremely red, low-gravity L7 dwarf 2MASS J11193254-1137466 is a 0.''14 (3.6 au) binary using Keck laser guide star adaptive optics imaging. 2MASS J11193254-1137466 has previously been identified as a likely member of the TW Hydrae Association (TWA). Using our updated photometric distance and proper motion, a kinematic analysis based on the BANYAN II model gives an 82% probability of TWA membership. At TWA's 10 ± 3 Myr age and using hot-start evolutionary models, 2MASS J11193254-1137466AB is a pair of 3.7–0.9+1.2MJup brown dwarfs, making it the lowest-mass binary discovered to date. We estimate an orbital period of 90–50+80 years. One component is marginally brighter in K band but fainter in J band, making this a probable flux-reversal binary, the first discovered with such a young age. We also imaged the spectrally similar TWA L7 dwarf WISEA J114724.10-204021.3 with Keck and found no sign of binarity. Our evolutionary model-derived Teff estimate for WISEA J114724.10-204021.3 is ≃230 K higher than for 2MASS J11193254-1137466AB, at odds with the spectral similarity of the two objects. This discrepancy suggests that WISEA J114724.10-204021.3 may actually be a tight binary with masses and temperatures very similar to 2MASS J11193254-1137466AB, or further supporting the idea that near-infrared spectra of young ultracool dwarfs are shaped by factors other than temperature and gravity. 2MASS J11193254-1137466AB will be an essential benchmark for testing evolutionary and atmospheric models in the young planetary-mass regime.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: close - brown dwarfs - stars: individual: (2MASS J11193254-1137466, WISEA J114724.10-204021.3) - stars: individual: (2MASS J11193254-1137466, WISEA J114724.10-204021.3)

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME THA As* 00 00 -62.0           ~ 317 0
2 HD 1160B LM* 00 15 57.26 +04 15 03.7           ~ 22 0
3 NAME 2MASS J01033563-5515561(AB)b Pl 01 03 35.654 -55 15 56.23           ~ 29 1
4 WISE J014656.66+423410.0 BD* 01 46 56.668 +42 34 10.05           Y0 18 0
5 2MASS J03572695-4417305 BD* 03 57 26.9620991711 -44 17 30.499748423         17.86 L0.6:V 29 3
6 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 908 0
7 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1597 1
8 * bet Pic b Pl 05 47 17.0919798264 -51 03 59.412857187           ~ 305 1
9 CD-35 2722b Pl 06 09 19.2082646634 -35 49 31.062882043           ~ 48 1
10 HD 44627B BD* 06 19 12.94 -58 03 20.9           L1 105 1
11 LP 261-75 B BD* 09 51 05.49 +35 58 02.1           L6V 39 0
12 NAME TW Hya Association As* 11 01.9 -34 42           ~ 795 0
13 USNO-B1.0 0783-00249513 PM* 11 19 31.1464383028 -11 38 17.887258216   15.8   13.8   ~ 1 0
14 TWA 42 BD* 11 19 32.543 -11 37 46.70           L7 22 0
15 CD-33 7795B BD* 11 31 55.4 -34 36 29     20.40   15.8 ~ 115 0
16 USNO-B1.0 0693-00264226 * 11 47 20.6157478957 -20 39 37.442574153   19.3   17.2   ~ 1 0
17 2MASS J11472421-2040204 BD* 11 47 24.214 -20 40 20.44           L7V 13 0
18 TWA 27 BD* 12 07 33.467 -39 32 54.00     19.95 17.99 15.88 M8Ve 304 1
19 TWA 27B BD* 12 07 33.50 -39 32 54.4           L5 226 1
20 BD+13 2618C BD* 13 00 41.936 +12 21 14.72         23.28 T8.5p 92 0
21 * e Vir b Pl 13 16 46.51596 +09 25 26.9590           ~ 72 1
22 NAME CFBDSIR 1458+1013 ** 14 58 29.0 +10 13 43           T8+Y0 24 0
23 HD 145689B BD* 16 17 04.35 -67 56 26.3           M9 7 0
24 NAME PZ Tel B PM* 18 53 05.8743 -50 10 49.880           M7+2 57 0
25 * eta Tel B BD* 19 22 51.26 -54 25 30.7           M7.5V 64 1
26 HD 203030B BD* 21 18 58.97 +26 13 46.1           L7.5 52 0
27 HD 206860B BD* 21 44 28.47168 +14 46 07.7988           T2.5 77 0
28 HD 218396c Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 172 1
29 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 156 1
30 HD 218396b Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 184 1
31 * kap And b Pl 23 40 24.5064536189 +44 20 02.175809921           ~ 48 1

    Equat.    Gal    SGal    Ecl

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2019.10.23-03:43:08

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