2019A&A...627A.167C


Query : 2019A&A...627A.167C

2019A&A...627A.167C - Astronomy and Astrophysics, volume 627A, 167-167 (2019/7-2)

Spectral characterization of newly detected young substellar binaries with SINFONI.

CALISSENDORFF P., JANSON M., ASENSIO-TORRES R. and KOHLER R.

Abstract (from CDS):

We observe 14 young low-mass substellar objects using the VLT/SINFONI integral field spectrograph with laser guide star adaptive optics to detect and characterize three candidate binary systems. All three binary candidates show strong signs of youth, with two of them likely belonging to young moving groups. Together with the adopted young-moving-group ages we employ isochrones from the BT-Settle CIFIST substellar evolutionary models to estimate individual masses for the binary components. We find 2MASS J15104786-2818174 to be part of the ~=30-50Myr Argus moving group and to be composed of a 34-48MJup primary brown dwarf with spectral type M9γ and a fainter 15-22MJup companion, separated by ~=100mas. 2MASS J22025794-5605087 is identified as an almost equal-mass binary in the AB Dor moving group, with a projected separation of ~=60mas. Both components share spectral type M9γ/β, which with the adopted age of 120-200Myr yields masses in the range of 50-68MJup for each component individually. The observations of 2MASS J15474719-2423493 are of lower quality and we obtain no spectral characterization for the target, but resolve two components separated by ~=170mas which with the predicted young field age of 30-50Myr yields individual masses below 20MJup. Out of the three candidate binary systems, 2MASS J22025794-5605087 has unambiguous spectroscopic signs of being a bona-fide binary, while the other two will require second-epoch confirmation. The small projected separations between the binary components correspond to physical separations of ~=4-7AU, meaning that astrometric monitoring of just a few years would be adequate to generate constrained orbital fits and dynamical masses for the systems. In combination with their young ages, these binaries will prove to be excellent benchmarks for calibrating substellar evolutionary models down to a very low-mass regime.

Abstract Copyright: © ESO 2019

Journal keyword(s): astrometry - brown dwarfs - binaries: close

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME THA As* 00 00 -62.0           ~ 468 0
2 WISE J014656.66+423410.0 BD* 01 46 56.66760 +42 34 10.0524           Y0 22 0
3 2MASS J02103857-3015313 BD* 02 10 38.5707996456 -30 15 31.356264060           L0gamma 13 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4429 0
5 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 472 0
6 NAME Luhman 16 ** 10 49 18.91536 -53 19 10.0776   16.86 16.20   14.95 L7.5+T0.5 96 0
7 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
8 TWA 42 BD* 11 19 32.54328 -11 37 46.6968           L7 39 0
9 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 340 0
10 WISE J121756.90+162640.8 BD* 12 17 56.90808 +16 26 40.8372           T9+Y0 41 0
11 2MASS J14252798-3650229 BD* 14 25 27.9845344257 -36 50 23.248617541           L4 46 0
12 2MASS J15104761-2818234 LM* 15 10 47.6042163408 -28 18 23.468154192           M9 8 0
13 2MASS J15104786-2818174 LM* 15 10 47.8572999576 -28 18 17.519894532           M8e 20 0
14 DENIS J154747.2-242349 LM* 15 47 47.1887180904 -24 23 49.570796976         17.16 M9.0V 19 0
15 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1332 1
16 WISE J171104.60+350036.8 BD* 17 11 04.60272 +35 00 36.8064           T8+T9.5 18 0
17 2MASS J17125805+0645416 BD* 17 12 58.054 +06 45 41.61           T2pec 5 0
18 PSO J272.0887-04.9943 BD* 18 08 21.29 -04 59 40.1           T1.5pec 4 0
19 2MASS J20113196-5048112 BD* 20 11 31.96320 -50 48 11.2032           L3 5 0
20 2MASS J20135152-2806020 BD* 20 13 51.5316626112 -28 06 02.182212360           L0gamma 18 0
21 2MASS J20334473-5635338 BD* 20 33 44.73936 -56 35 33.8460           L0 5 0
22 2MASS J21171431-2940034 BD* 21 17 14.312 -29 40 03.42           T0: 10 0
23 2MASS J22025794-5605087 LM* 22 02 57.9523063656 -56 05 08.745099684           M9: 5 0
24 2MASS J22351658-3844154 BD* 22 35 16.5859080768 -38 44 15.434825892           L1.5 6 0
25 2MASS J22353560-5906306 LM* 22 35 35.6106288528 -59 06 30.604392504           M8.5 6 0
26 2MASS J23225240-6151114 LM* 23 22 52.4232118656 -61 51 11.472012288           M5 8 0
27 2MASS J23225299-6151275 BD* 23 22 53.0081802408 -61 51 27.526074804           L2gamma 23 0

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