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2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF

Author(s)
Cushing, Michael C.; Looper, Dagny L.; Burgasser, Adam J.; Kirkpatrick, J. Davy; Faherty, Jacqueline K.; Cruz, Kelle L.; Sweet, Anne; Sanderson, Robyn Ellyn; ... Show more Show less
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Abstract
We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressure-broadened K I resonant doublet, Cs I and Rb I lines, molecular bands of CaH, TiO, CrH, FeH, and H[subscript 2]O, and enhanced collision induced absorption of H[subscript 2]. We assign 2MASS J0616–6407 a spectral type of sdL5 based on a comparison of its red optical spectrum to that of near solar-metallicity L dwarfs. Its high proper motion (μ = 1farcs405 ± 0.008 yr[superscript –1]), large radial velocity (V rad = 454 ± 15 km s[superscript –1]), estimated u, v, w velocities (94, –573, 125) km s[superscript –1] and Galactic orbit with an apogalacticon at ~29 kpc are indicative of membership in the outer halo making 2MASS J0616–6407 the first ultracool member of this population.
Date issued
2009-04
URI
http://hdl.handle.net/1721.1/52700
Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Citation
Cushing, Michael C. et al "2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF." The Astrophysical Journal 696.1 (2009): 986.
Version: Original manuscript
Other identifiers
arXiv:0902.1059v1
ISSN
0004-637X

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