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Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3π Survey

Best, W.M.J.; Magnier, E.A.; Liu, M.C.; Aller, K.M.; Zhang, Z.; Burgett, W.S.; Chambers, K.C.; Draper, P.; Flewelling, H.; Kaiser, N.; Kudritzki, R.-P.; Metcalfe, N.; Tonry, J.L.; Wainscoat, R.J.; Waters, C.

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3π Survey Thumbnail


W.M.J. Best

E.A. Magnier

M.C. Liu

K.M. Aller

Z. Zhang

W.S. Burgett

K.C. Chambers

P. Draper

H. Flewelling

N. Kaiser

R.-P. Kudritzki

J.L. Tonry

R.J. Wainscoat

C. Waters


We present a catalog of 9888 M, L and T dwarfs detected in the Pan-STARRS1 3π Survey (PS1), covering three-quarters of the sky. Our catalog contains nearly all known objects of spectral types L0–T2 in the PS1 field, with objects as early as M0 and as late as T9, and includes PS1, 2MASS, AllWISE, and Gaia DR1 photometry. We analyze the different types of photometry reported by PS1 and use two types in our catalog in order to maximize both depth and accuracy. Using parallaxes from the literature, we construct empirical SEDs for field ultracool dwarfs spanning 0.5–12 μm. We determine typical colors of M0–T9 dwarfs and highlight the distinctive colors of subdwarfs and young objects. We combine astrometry from PS1, 2MASS, and Gaia DR1 to calculate new proper motions for our catalog. We achieve a median precision of 2.9 mas yr−1, a factor of ≈3−10 improvement over previous large catalogs. Our catalog contains proper motions for 2405 M6–T9 dwarfs and includes the largest set of homogeneous proper motions for L and T dwarfs published to date, 406 objects for which there were no previous measurements, and 1176 objects for which we improve upon previous literature values. We analyze the kinematics of ultracool dwarfs in our catalog and find evidence that bluer but otherwise generic late-M and L field dwarfs (i.e., not subdwarfs) tend to have tangential velocities higher than those of typical field objects. With the public release of the PS1 data, this survey will continue to be an essential tool for characterizing the ultracool dwarf population.


Best, W., Magnier, E., Liu, M., Aller, K., Zhang, Z., Burgett, W., …Waters, C. (2018). Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3π Survey. Astrophysical Journal Supplement, 234(1), Article 1.

Journal Article Type Article
Acceptance Date Oct 4, 2017
Online Publication Date Dec 27, 2017
Publication Date Jan 1, 2018
Deposit Date Jan 15, 2018
Publicly Available Date Jan 22, 2018
Journal Astrophysical Journal Supplement
Print ISSN 0067-0049
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 234
Issue 1
Article Number 1


Published Journal Article (6.9 Mb)

Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.

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