VIRAC: The VVV Infrared Astrometric Catalogue
We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA Variables in the Via Lactea (VVV) survey for 312 587 642 unique sources averaged across all overlapping pawprint and tile images covering 560 deg 2 of the bulge of the MilkyWay and southern disc. The catalogue includes 119 million high-quality proper motion measurements, of which 47 million have statistical uncertainties below 1 mas yr -1. In the 11 < K s < 14 magnitude range, the high-quality motions have a median uncertainty of 0.67 mas yr -1. The catalogue also includes 6935 sources with quality-controlled 5s parallaxes with a median uncertainty of 1.1 mas. The parallaxes show reasonable agreement with the Tycho- Gaia Astrometric Solution, though caution is advised for data with modest significance. The SQL data base housing the data is made available via the web. We give example applications for studies of Galactic structure, nearby objects (low-mass stars and brown dwarfs, subdwarfs, white dwarfs) and kinematic distance measurements of young stellar objects. Nearby objects discovered include LTT 7251 B, an L7 benchmark companion to a G dwarf with over 20 published elemental abundances, a bright L subdwarf, VVV 1256-6202, with extremely blue colours and nine new members of the 25 pc sample. We also demonstrate why this catalogue remains useful in the era of Gaia. Future versions will be based on profile fitting photometry, use the Gaia absolute reference frame and incorporate the longer time baseline of the VVV extended survey.
Item Type | Article |
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Uncontrolled Keywords | Brown dwarfs; Galaxy: kinematics and dynamics; Parallaxes; Proper motions; Solar neighbourhood; Stars: kinematics and dynamics |
Subjects |
Physics and Astronomy(all) > Astronomy and Astrophysics Earth and Planetary Sciences(all) > Space and Planetary Science |
Date Deposited | 26 Jul 2024 23:32 |
Last Modified | 26 Jul 2024 23:32 |
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Read more research from the creator(s):
- Smith, L. C.
- Lucas, P. W.
- Kurtev, R.
- Smart, R.
- Minniti, D.
- Borissova, J.
- Jones, H. R. A
- Zhang, Z. H.
- Marocco, F.
- Peña, C. Contreras
- Gromadzki, M.
- Kuhn, M. A.
- Drew, J. E.
- Pinfield, D. J.
- Bedin, L.R.
Find work associated with the faculties and division(s):
- School of Physics, Astronomy and Mathematics
- Centre for Astrophysics Research
- School of Engineering and Technology
- Centre of Data Innovation Research
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