2005A&A...430L..49S


Query : 2005A&A...430L..49S

2005A&A...430L..49S - Astronomy and Astrophysics, volume 430, L49-52 (2005/2-2)

SSSPM J1102-3431: A probable new young brown dwarf member of the TW Hydrae Association.

SCHOLZ R.-D., McCAUGHREAN M.J., ZINNECKER H. and LODIEU N.

Abstract (from CDS):

We have used archival survey data, most importantly from the SuperCOSMOS Sky Surveys, to derive accurate proper motions and thus confirm the membership of two previously announced isolated brown dwarfs in the nearby, ∼10Myr old TW Hydrae Association (TWA), 2MASSW J1207334-393254 and 2MASSW 1139511-315921 (Gizis, 2002ApJ...575..484G), and to discover a new substellar candidate. This new object, SSSPM J1102-3431, has extremely red optical, optical-to-infrared, and near-infrared colours (R-I=3.2, I-J=3.4, J-Ks=1.15), while low-resolution not only classifies it as a late-type (M8.5) object, but also shows spectral signatures of low gravity as expected for a young brown dwarf. If it is a true TWA member, brown dwarf cooling models predict its mass to be ∼20MJup. SSSPM J1102-3431 lies only ∼12-arcmin away from the T Tauri star TW Hya and their proper motions agree to within the errors, and thus it is possible that the two objects form an extremely wide binary system, with a separation of ∼40000AU at d=56pc. We have also obtained improved proper motions for SSS 120727.4-324700 and SSS 101726.7-535428, recent additions to the list of TWA members (Song et al., 2003ApJ...599..342S). The relatively large proper motion of the latter object is consistent with the suggested proximity (d∼22pc) of this lowest-mass stellar representative of the TWA.

Abstract Copyright:

Journal keyword(s): astrometry and celestial mechanics: astrometry - surveys - stars: kinematics - stars: low-mass, brown dwarfs - open clusters and associations: individual: TW Hydrae

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 284 0
2 TWA 22 LXB 10 17 26.8927745040 -53 54 26.387425044   15.69 13.96 13.72   M5 81 0
3 DENIS J104814.6-395606 LM* 10 48 14.5736104113 -39 56 06.842743867     17.532 15.051 12.67 M8.5Ve: 127 0
4 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1826 1
5 NAME TW Hya Association As* 11 01.9 -34 42           ~ 914 0
6 TWA 28 LM* 11 02 09.8378779824 -34 30 35.562199176     21.46 19.14 17.90 M8.3 65 0
7 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 367 0
8 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 104 0
9 HD 102458 Y*O 11 47 24.5438206248 -49 53 03.018484572   9.70 9.07   8.40 G4V 91 0
10 TWA 23 TT* 12 07 27.3763935312 -32 47 00.242923776   14.157 12.638 12.273   M2.5Ve 68 0
11 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 331 0
12 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 610 1

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2023.06.10-14:03:24

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