2013A&A...557L...8B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST21:48:19

2013A&A...557L...8B - Astronomy and Astrophysics, volume 557, L8-8 (2013/9-1)

One more neighbor: the first brown dwarf in the VVV survey.

BEAMIN J.C., MINNITI D., GROMADZKI M., KURTEV R., IVANOV V.D., BELETSKY Y., LUCAS P., SAITO R.K. and BORISSOVA J.

Abstract (from CDS):

The discovery of brown dwarfs (BDs) in the solar neighborhood and young star clusters has helped to constraint the low-mass end of the stellar mass function and the initial mass function. We use data of the Vista Variables in the Via Lactea (VVV), a near-infrared (NIR) multi-wavelength (ZYJH Ks) multi-epoch (Ks) ESO Public Survey mapping the Milky Way bulge and southern Galactic plane to search for nearby BDs. The ultimate aim of the project is to improve the completeness of the census of nearby stellar and substellar objects towards the Galactic bulge and inner disk regions. Taking advantage of the homogeneous sample of VVV multi-epoch data, we identified stars with high proper motion (≥0.1"/yr), and then selected low-mass objects using NIR colors. We searched for a possible parallax signature using the all available Ks band epochs. We set some constraints on the month-to-year scale Ks band variability of our candidates, and even searched for possible transiting companions. We obtained NIR spectra to properly classify spectral type and then the physical properties of the final list of candidates. We report the discovery of VVV BD001, a new member of the local volume-limited sample (within 20pc from the Sun) with well defined proper motion, distance, and luminosity. The spectral type of this new object is an L5±1, unusually blue dwarf. The proper motion for this BD is PM(α)=-0.5455±0.004"/yr, PM(δ)=-0.3255±0.004"/yr, and it has a parallax of 57±4mas which translates into a distance of 17.5±1.1pc. VVV BD001 shows no evidence of variability (ΔKs<0.05mag) over two years, especially constrained on a six month scale during the year 2012.

Abstract Copyright:

Journal keyword(s): brown dwarfs - methods: observational - techniques: imaging spectroscopy - surveys - proper motions - astrometry

Simbad objects: 9

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Number of rows : 9

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 2MASSI J0825196+211552 BD* 08 25 19.6171008398 +21 15 51.565129705       21.97 19.22 L7.5V 106 0
2 2MASS J11463449+2230527 BD* 11 46 34.52016 +22 30 53.0856           L3+L4 84 0
3 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 174 0
4 2MASSW J1515008+484742 BD* 15 15 00.62664 +48 47 44.8548           L6.5 51 0
5 HD 329472 * 17 06 11.0294461385 -45 00 37.556387023   12.35 11.86     A 3 0
6 VVV BD001 BD* 17 26 40.2 -27 38 03           L5 5 0
7 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0
8 2MASSW J2224438-015852 BD* 22 24 43.8550503291 -01 58 53.265872547           L4.5V 110 0
9 NAME Galactic Bulge reg ~ ~           ~ 3564 0

    Equat.    Gal    SGal    Ecl

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