2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF
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Burgasser_2MASSJ06164006.pdf
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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
Date Issued
April 2009
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
http://dx.doi.org/10.1088/0004-637x/696/1/986
