2015A&A...579A..61S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:16:11

2015A&A...579A..61S - Astronomy and Astrophysics, volume 579A, 61-61 (2015/7-1)

DE 0823-49 is a juvenile binary brown dwarf at 20.7 pc.

SAHLMANN J., BURGASSER A.J., MARTIN E.L., LAZORENKO P.F., BARDALEZ GAGLIUFFI D.C., MAYOR M., SEGRANSAN D., QUELOZ D. and UDRY S.

Abstract (from CDS):

Astrometric monitoring of the nearby early-L dwarf DE0823-49 has revealed a low-mass companion in a 248-day orbit that was announced in an earlier work. Here, we present new astrometric and spectroscopic observations that allow us to characterise the system in detail. The optical spectrum shows LiI-absorption indicative of a young age and/or substellar mass for the primary component. The near-infrared spectrum is best reproduced by a binary system of brown dwarfs with spectral types of L1.5 + L5.5 and effective temperatures of 2150±100K and 1670±140K. To conform with the photocentric orbit size measured with astrometry and the current understanding of substellar evolution, the system must have an age in the 80-500Myr range. Evolutionary models predict component masses in the ranges of M1≃0.028-0.063M and M2≃0.018-0.045M with a mass ratio of q≃0.64-0.74. Multi-epoch radial velocity measurements unambiguously establish the three-dimensional orbit of the system and allow us to investigate its kinematic properties. DE0823-49 emerges as a rare example of a nearby brown dwarf binary with orbit, component properties, and age that are characterised well. It is a juvenile resident of the solar neighbourhood, but does not appear to belong to a known young association or moving group.

Abstract Copyright:

Journal keyword(s): binaries: close - brown dwarfs - stars: low-mass - planetary systems - astrometry - techniques: spectroscopic

Simbad objects: 16

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Number of rows : 16

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 2MASS J00145575-4844171 BD* 00 14 55.7711152339 -48 44 16.902088987         17.544 L2.5 14 0
2 EROS-MP J0032-4405 BD* 00 32 55.8473481611 -44 05 05.754867926         18.01 L0.5V 36 0
3 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 263 0
4 DENIS J060852.8-275358 LM* 06 08 52.8335033384 -27 53 58.318927109         17.011 M9.6V 43 0
5 DENIS J082303.1-491201 BD* 08 23 03.1457502969 -49 12 01.265841098       20.020 17.14 L1.5 13 0
6 HD 83719 El* 09 38 58.1147470814 -49 03 39.660404817   7.70 7.64   7.568 A0V 12 0
7 HD 87363 * 10 03 20.5812117526 -46 38 10.277039943   6.140 6.101     A0V 22 0
8 LSPM J1048+0111 BD* 10 48 42.8148643194 +01 11 58.221459212       19.4   L1 39 0
9 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
10 TWA 29 LM* 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 42 0
11 2MASSW J1411175+393636 BD* 14 11 17.3885771929 +39 36 36.394932986           L1.5V 19 0
12 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 557 0
13 2MASS J17054834-0516462 BD* 17 05 48.3507836186 -05 16 46.341214454         16.55 L1 36 0
14 2MASSI J2002507-052152 BD* 20 02 50.7114995555 -05 21 52.582497214           L5.5 22 0
15 2MASS J20575409-0252302 BD* 20 57 54.0935087240 -02 52 30.249848091           L1 50 0
16 NAME Pleiades Moving Group MGr ~ ~           ~ 238 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:16:11

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