Published November 6, 2018 | Version v1
Conference paper Open

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

Authors/Creators

  • 1. Institut UTINAM, CNRS UMR6213, Univ. Bourgogne Franche-Comté, OSU THETA Franche-Comté-Bourgogne, Observatoire de Besançon, BP 1615, 25010 Besançon Cedex, France

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Description

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. This paper aims to investigate the content of Gaia DR2 at the low-mass end and to characterize ultra-cool and brown dwarfs. We first retrieved the sample of spectroscopically confirmed ultra-cool stars and brown dwarfs (>M6) in Gaia DR2. We used their locus in the precise Hertzsprung-Russel diagram to select new candidates and to investigate their properties. About 70% of the bright enough objects from the known sample are recovered, filling the gap with Gaia DR1. Furthermore, Gaia DR2 contains ∼100 000 >M6 and ∼1000 L candidates (all are . L5). A tentative classification suggests that a few hundred of them are young or subdwarf candidates. Their distance distribution shows that the solar neighbourhood census is still not complete. Gaia DR2 offers a great wealth of information on low-mass objects. It provides a homogeneous and precise catalogue of candidates that is worthwhile to be further characterized with spectroscopic observations.

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