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Communication Dans Un Congrès Année : 2021

Ultra-cool dwarfs in wide binaries from Gaia

Résumé

Ultra-cool dwarfs (UCDs) serve as a link between the lowest mass stars and the brown dwarfs. Gaia DR2 revealed thousands of ultra-cool dwarfs not identified as such before. In this work, we searched for companions to those in the Gaia catalogue, from their common proper motions and parallaxes. We found about 2,300 stars in multiple systems, about 1,300 of them being UCDs out of the original 16,500 sample. Among the companions, there are several tens of young stellar objects and white dwarfs, but also new M7-L2 candidates. Such a sample can be used to better understand the binary properties of UCDs and to better characterize the physics of UCDs thanks to the characterization of higher mass companions.
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Dates et versions

hal-03863241 , version 1 (27-11-2023)

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Céline Reylé, Victor Gimenez Sanchez, Nadège Lagarde. Ultra-cool dwarfs in wide binaries from Gaia. The 20.5th Cambridge Workshop on Cool Stars, Mar 2021, Online, France. ⟨10.5281/zenodo.4730624⟩. ⟨hal-03863241⟩
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