Abstract
We present VIRAC2, a catalogue of positions, proper motions, parallaxes and Z, Y, J, H, and K_s near-infrared photometric time series of 545 346 537 unique stars. The catalogue is based on a point spread function fitting reduction of nearly a decade of VISTA VVV and VVVX images, which cover 560 deg^2 of the Southern Galactic plane and bulge. The catalogue is complete at the >90 per cent level for <Ks mag<1
11<Ks<16 sources, but extends to Ks≈17.5 mag in most fields. Astrometric performance for 11<Ks mag<14 sources is typically ≈0.37 mas yr−1per dimension for proper motion, and 1 mas for parallax. At Ks=16 the equivalent values are around 1.5 mas yr−1and 5 mas. These uncertainties are validated against Gaia DR3 and Hubble Space Telescope astrometry. The complete catalogues are available via the ESO archive. We perform an initial search of the catalogue for nearby ultracool dwarf candidates. In total we find 26 new sources whose parallaxes place them within 50 parsecs of the Sun. Among them we find two high-confidence T dwarfs and a number of other sources that appear to lie close to the L/T transition.
11<Ks<16 sources, but extends to Ks≈17.5 mag in most fields. Astrometric performance for 11<Ks mag<14 sources is typically ≈0.37 mas yr−1per dimension for proper motion, and 1 mas for parallax. At Ks=16 the equivalent values are around 1.5 mas yr−1and 5 mas. These uncertainties are validated against Gaia DR3 and Hubble Space Telescope astrometry. The complete catalogues are available via the ESO archive. We perform an initial search of the catalogue for nearby ultracool dwarf candidates. In total we find 26 new sources whose parallaxes place them within 50 parsecs of the Sun. Among them we find two high-confidence T dwarfs and a number of other sources that appear to lie close to the L/T transition.
Original language | English |
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Article number | stae2797 |
Pages (from-to) | 3707–3738 |
Number of pages | 32 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 536 |
Issue number | 4 |
Early online date | 20 Dec 2024 |
DOIs | |
Publication status | E-pub ahead of print - 20 Dec 2024 |
Keywords
- astro-ph.GA
- astro-ph.SR
- brown dwarfs
- Galaxy: kinematics and dynamics
- parallaxes
- stars: kinematics and dynamics
- solar neighbourhood
- proper motions