Published December 2, 2022 | Version v1

Identifying M dwarfs in VVV survey using Gaia

  • 1. Centro de Astrobiología (CAB/CSIC-INTA), Spain
  • 2. Departamento de Ciencias Físicas, Universidad Andrés Bello, Chile
  • 3. Departamento de Física, Universidade Federal de Santa Catarina, Brazil

Description

M-dwarf stars account for more than 70% of the stars in our galaxy and have an important role in several astrophysical contexts, for instance, as prime targets in the search for life outside our Solar System. In this work we aim to identify and characterise M dwarfs in the b294 tile from Vista Variables in the Vía Láctea (VVV) survey, a deep near-infrared survey towards Galactic southern plane. We used parallax measurements and proper motions from Gaia Early Data Release 3, in addition to different colour cuts based on VISTA filters, to  select a list of 7896 M dwarfs within tile b294. We performed a SED fitting to obtain the effective temperature for all objects using broad-band photometry available at Virtual Observatory archives. The objects in our sample have temperatures varying from 2800 to 3900 K. In the near future, we will search for transit-like events in the VVV light curves with around 300 observed epochs.

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