2011AJ....141....7D


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET16:08:16

2011AJ....141....7D - Astron. J., 141, 7 (2011/January-0)

Resolved spectroscopy of M Dwarf/L dwarf binaries. IV. Discovery of AN M9 + L6 binary separated by over 100 AU.

DHITAL S., BURGASSER A.J., LOOPER D.L. and STASSUN K.G.

Abstract (from CDS):

We report the discovery of a faint L6±1 companion to the previously known M9 dwarf, 2MASS J01303563-4445411, based on our near-infrared imaging and spectroscopic observations with the 3 m Infrared Telescope Facility SpeX imager/spectrometer. The visual binary is separated by 3".28±0".05 on the sky at a spectrophotometric distance of 40±14 pc. The projected physical separation is 130±50 AU, making it one of the widest very low mass (VLM) field multiples containing a brown dwarf companion. 2MASS J0130-4445 is only one of ten wide VLM pairs and only one of six in the field. The secondary is considerably fainter (ΔK~ 2.35 mag) and redder (Δ (J - Ks) ~ 0.81 dex), consistent with component near-infrared types of M9.0±0.5 and L6±1 based on our resolved spectroscopy. The component types suggest a secondary mass well below the hydrogen-burning limit and an age-dependent mass ratio of 0.6-0.9. The system's space motion and spectroscopic indicators suggest an age of 2-4 Gyr while the model-dependent masses and binding energies suggest that this system is unlikely to have formed via dynamical ejection. The age, composition, and separation of the 2MASS J01303563-4445411 system make it useful for tests of VLM formation theories and of condensate cloud formation in L dwarfs.

Abstract Copyright:

Journal keyword(s): binaries: visual - brown dwarfs - stars: individual: 2MASS J01303563-4445411 - stars: low-mass

Nomenclature: [DBL2011] 2MASS J0130-4445 N=1, [DBL2011] 2MASS J0130-4445A (Nos A-B).

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 - 2020
#notes
1 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 228 0
2 HD 8977 * 01 27 35.2721523844 -46 09 06.047380013   7.799 7.691     A0V 25 0
3 [DBL2011] 2MASS J0130-4445A BD* 01 30 35.60 -44 45 41.2           M9.0V 1 0
4 2MASS J01303563-4445411 BD* 01 30 35.6390041480 -44 45 41.188952404         17.18 M9+L6 4 0
5 [DBL2011] 2MASS J0130-4445B BD* 01 30 35.80 -44 45 41.4           L7.5 2 0
6 2MUCD 10176 BD* 03 18 54.037 -34 21 29.22           L7 22 0
7 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 794 2
8 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2924 0
9 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3354 0
10 LEHPM 2-183 PM* 05 17 37.6984215869 -33 49 03.072363791   21.1       M8.0V 23 0
11 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1921 1
12 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 734 0
13 USNO-B1.0 0644-00098276 BD* 06 52 19.7631187838 -25 34 50.466131332       19.3 15.96 M9.2V 15 0
14 2MUCD 20480 BD* 13 26 20.099 -27 29 37.09           L7 14 0
15 2MASS J14162408+1348263 BD* 14 16 24.0749913653 +13 48 26.176168678           L7+T7.5 55 0
16 2MASS J15200224-4422419 BD* 15 20 02.242 -44 22 41.99       19.4 16.89 L1 21 0
17 2MASS J16233609-2402209 Y*? 16 23 36.09 -24 02 20.9       17.4 14.68 M5 16 0
18 2MASS J17072343-0558249 ** 17 07 23.435 -05 58 24.92       18.9 15.38 M9+L3 25 0

    Equat.    Gal    SGal    Ecl

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