SIMBAD references

2018A&A...619L...8R - Astronomy and Astrophysics, volume 619, L8-8 (2018/11-1)

New ultra-cool and brown dwarf candidates in Gaia DR2.

REYLE C.

Abstract (from CDS):


Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources. The resulting Hertzsprung-Russel diagram reveals fine structures throughout the mass range.
Aims. This paper aims to investigate the content of Gaia DR2 at the low-mass end and to characterize ultra-cool and brown dwarfs.
Methods. We first retrieved the sample of spectroscopically confirmed ultra-cool and brown dwarfs in Gaia DR2. We used their locus in the precise Hertzsprung-Russel diagram to select new candidates and to investigate their properties.
Results. The number of spectroscopically confirmed objects recovered in Gaia DR2 corresponds to 61% and 74% of the expected number of objects with an estimated Gaia magnitude Gest≤21.5 and 20.3, respectively. This fills much of the gap to Gaia DR1. Furthermore, Gaia DR2 contains ∼13000≥M7 and 631 new L candidates. A tentative classification suggests that a few hundred of them are young or subdwarf candidates. Their distance distribution shows that the solar neighborhood census is still incomplete.
Conclusions. Gaia DR2 offers a great wealth of information on low-mass objects. It provides a homogeneous and precise catalog of candidates that is worthwhile to be further characterized with spectroscopic observations.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: low-mass - solar neighborhood - Galaxy: stellar content - surveys - catalogs

VizieR on-line data: <Available at CDS (J/A+A/619/L8): table2.dat>

Simbad objects: 14916

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2020.09.26-01:27:28

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