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


Query : 2014A&A...561A.113S

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 - 2022
#notes
1 2MASS J02540788+0223563 BD* 02 54 07.88640 +02 23 56.3460           T8.0 24 0
2 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 274 0
3 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 117 0
4 NAME Scholz's star LM* 07 20 03.25368 -08 46 49.9044   19.9   16.9 13.80 M9.5+T5 45 0
5 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 121 0
6 VB 10 Er* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 459 1

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2022.05.21-02:53:26

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