New ultra-cool and brown dwarf candidates in Gaia DR2
Abstract
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 G est ≤ 21.5 and 20.3, respectively. This fills much of the gap to Gaia DR1. Furthermore, Gaia DR2 contains Ȉ13 000 ≥ 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 2018
- DOI:
- 10.1051/0004-6361/201834082
- arXiv:
- arXiv:1809.08244
- Bibcode:
- 2018A&A...619L...8R
- Keywords:
-
- stars: low-mass;
- solar neighborhood;
- Galaxy: stellar content;
- surveys;
- catalogs;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- accepted for publication in A&