2012A&A...548A..33C


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:56:56

2012A&A...548A..33C - Astronomy and Astrophysics, volume 548A, 33-33 (2012/12-1)

Deep search for companions to probable young brown dwarfs. VLT/NACO adaptive optics imaging using IR wavefront sensing.

CHAUVIN G., FAHERTY J., BOCCALETTI A., CRUZ K., LAGRANGE A.-M., ZUCKERMAN B., BESSELL M.S., BEUZIT J.-L., BONNEFOY M., DUMAS C., LOWRANCE P., MOUILLET D. and SONG I.

Abstract (from CDS):

We have obtained high contrast images of four nearby, faint, and very low mass objects 2MASSJ04351455-1414468, SDSSJ044337.61+000205.1, 2MASSJ06085283-2753583 and 2MASSJ06524851-5741376 (hereafter 2MASS0435-14, SDSS0443+00, 2MASS0608-27 and 2MASS0652-57), identified in the field as probable isolated young brown dwarfs. Our goal was to search for binary companions down to the planetary mass regime. We used the NAOS-CONICA adaptive optics instrument (NACO) and its unique capability to sense the wavefront in the near-infrared to acquire sharp images of the four systems in Ks, with a field of view of 28''x28''. Additional J and L' imaging and follow-up observations at a second epoch were obtained for 2MASS0652-57. With a typical contrast ΔKs=4.0-7.0mag, our observations are sensitive down to the planetary mass regime considering a minimum age of 10 to 120Myr for these systems. No additional point sources are detected in the environment of 2MASS0435-14, SDSS0443+00 and 2MASS0608-27 between 0.1-12'' (i.e. about 2 to 250AU at 20pc). 2MASS0652-57 is resolved as a ∼230mas binary. Follow-up observations reject a background contaminate, resolve the orbital motion of the pair, and confirm with high confidence that the system is physically bound. The J, Ks and L' photometry suggest a q∼0.7-0.8 mass ratio binary with a probable semi-major axis of 5-6AU. Among the four systems, 2MASS0652-57 is probably the less constrained in terms of age determination. Further analysis would be necessary to confirm its youth. It would then be interesting to determine its orbital and physical properties to derive the system's dynamical mass and to test evolutionary model predictions.

Abstract Copyright:

Journal keyword(s): brown dwarfs - binaries: close - instrumentation: adaptive optics - techniques: image processing

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J04351455-1414468 LM* 04 35 14.5579229768 -14 14 46.652084016       18.7   M7 12 0
2 LDN 1642 MoC 04 35 18 -14 13.9           ~ 138 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3572 0
4 2MASSI J0443376+000205 LM* 04 43 37.6087816580 +00 02 05.109219492     19.6   15.877 M9.0V 45 0
5 MLLA 394 * 05 35 15.29340 -05 23 23.1241           ~ 20 0
6 MLLA 367 * 05 35 15.55170 -05 23 29.5216           ~ 19 0
7 TCC 54 Rad 05 35 16.06922 -05 23 24.3483           ~ 58 0
8 TCC 57 Y*O 05 35 16.07 -05 23 27.8           ~ 41 0
9 TCC 58 * 05 35 16.09280 -05 23 23.0106           ~ 28 1
10 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1285 1
11 DENIS J060852.8-275358 LM* 06 08 52.8335033384 -27 53 58.318927109         17.011 M9.6V 44 0
12 DENIS J065248.5-574137 LM* 06 52 48.5249726756 -57 41 37.048970291         16.57 M8: 7 0
13 CHSM 1982 Y*O 11 04 10.6080493790 -76 12 49.058501690           M6e 14 0
14 NAME Cha I MoC 11 06 48 -77 18.0           ~ 990 1
15 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 244 0
16 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 581 0
17 NAME Upper Sco Association As* 16 12 -23.4           ~ 1064 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:56:56

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