High Proper Motion Discoveries from the UKIRT Hemisphere Survey
Authors
Wings Zhang
Adam C. Schneider
Thomas P. Bickle
Adam J. Burgasser
Emma Softich
Federico Marocco
Daniella Bardalez Gagliuffi
Jacqueline K. Faherty
Aaron M. Meisner
J. Davy Kirkpatrick
Marc J. Kuchner
Martin Kabatnik
Frank Kiwy
Arttu Sainio
Jörg Schümann
Karl Selg-Mann
Nikolaj Stevnbak Andersen
Bruce Baller
Paul Beaulieu
John Bell
Dan Caselden
Guillaume Colin
Alexandru Dereveanco
Christoph Frank
Konstantin Glebov
Léopold Gramaize
Leslie K. Hamlet
David W. Martin
William Pendrill
Stéphane Perlin
Andres Stenner
Christopher Tanner
Melina Thévenot
Vinod Thakur
Nikolaj Stevnbak Andersen
Abstract
We used the third data release of the UKIRT Hemisphere Survey to locate previously unrecognized high proper motion objects. We identify a total of 127 new discoveries with total proper motions $\gtrsim$300 mas yr$^{-1}$. A significant fraction of these sources with counterparts in the Gaia DR3 catalog are found to be distant ($>$100 pc) low-mass stars, where their large tangential velocities and placement on color-magnitude diagrams suggest that they are likely low-metallicity M-type subdwarfs. Optical spectroscopy is used to confirm the low-mass and low-metallicity for two such sources. Using available optical and infrared photometry, we estimate the spectral type for all non-Gaia sources and find 10 likely late-M dwarfs, 15 objects with colors most consistent with L-type dwarfs, and 9 possible T-type dwarfs. Follow-up spectroscopy is needed to confirm spectral types and further characterize these new discoveries.
