2014A&A...561A.113S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET01:17:30

2014A&A...561A.113S - Astronomy and Astrophysics, volume 561A, 113-113 (2014/1-1)

Neighbours hiding in the Galactic plane, a new M/L dwarf candidate for the 8 pc sample.

SCHOLZ R.-D.

Abstract (from CDS):

Using Wide-field Infrared Survey Explorer (WISE) data and previous optical and near-infrared sky surveys, we try to identify still missing stellar and substellar neighbours of the Sun. When checking the brightest red WISE sources for proper motions and colours expected for nearby M and L dwarfs, we also approached the thin Galactic plane. Astrometry (proper motion and parallax measurements) and the available photometry were used to obtain first estimates of the distance and type of nearby candidates. We have discovered WISE J072003.20-084651.2, an object with moderately high proper motion (µ≃120 mas/yr) that lies at low Galactic latitude (b = + 2.3°), with similar brightness (J ≃10.6, w2 ≃8.9) and colours (I-J ≃3.2, J-Ks≃1.2, w1 - w2 ≃0.3) as the nearest known M-type brown dwarf LP 944-20. With a photometric classification as an M9±1 dwarf, its photometric distance lies in the range between about 5 and 7 pc, based on comparison with absolute magnitudes of LP 944-20 alone or of a sample of M8-L0 dwarfs. The slightly larger distance derived from our preliminary trigonometric parallax (7.0±1.9 pc) may indicate a close binary nature. The new neighbour is an excellent target for planet search and low-mass star/brown dwarf studies.

Abstract Copyright:

Journal keyword(s): astrometry - proper motions - stars: distances - stars: kinematics and dynamics - brown dwarfs - solar neighborhood

Simbad objects: 6

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Number of rows : 6

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 J02540788+0223563 BD* 02 54 07.88640 +02 23 56.3460           T8.0 23 0
2 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 266 0
3 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1604506693 +25 40 23.246972754         17.36 L0V 115 0
4 2MASS J07200325-0846499 LM* 07 20 03.25368 -08 46 49.9044   19.9   16.9 13.80 M9.5+T5 41 0
5 2MASS J14392836+1929149 BD* 14 39 28.36896 +19 29 14.9820           L1V 117 0
6 VB 10 Er* 19 16 57.6103282334 +05 09 01.588675251     17.30     M8V 441 1

    Equat.    Gal    SGal    Ecl

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2021.01.26-01:17:30

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