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Title:
Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
Authors:
Cruz, Kelle L.; Reid, I. Neill; Kirkpatrick, J. Davy; Burgasser, Adam J.; Liebert, James; Solomon, Adam R.; Schmidt, Sarah J.; Allen, Peter R.; Hawley, Suzanne L.; Covey, Kevin R.
Affiliation:
AA(NSF Astronomy and Astrophysics Postdoctoral Fellow; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.), AB(Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation; Space Telescope Science Institute, Baltimore, MD, USA), AC(Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA, USA), AD(Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA), AE(Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation; Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ, USA), AF(Department of Astrophysics, American Museum of Natural History, New York, NY, US; John F. Kennedy High School, Bellmore, NY, USA; Department of Astronomy, Yale University, New Haven, CT, USA ), AG(Department of Astrophysics, American Museum of Natural History, New York, NY, US; Department of Physics and Astronomy, Barnard College, Columbia University, New York, NY, USA; Department of Astronomy, University of Washington, Seattle, WA, USA ), AH(Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation; Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA, USA), AI(Department of Astronomy, University of Washington, Seattle, WA, USA), AJ(Department of Astronomy, University of Washington, Seattle, WA, USA)
Publication:
The Astronomical Journal, Volume 133, Issue 2, pp. 439-467. (AJ Homepage)
Publication Date:
02/2007
Origin:
UCP
Astronomy Keywords:
Galaxy: stellar content, solar neighborhood, stars: late-type, stars: low-mass, brown dwarfs, stars: luminosity function, mass function
DOI:
10.1086/510132
Bibliographic Code:
2007AJ....133..439C

Abstract

We present a 20 pc, volume-limited sample of M7-L8 dwarfs created through spectroscopic follow-up of sources selected from the Two Micron All Sky Survey Second Incremental Release Point Source Catalog. In this paper we present optical spectroscopy of 198 candidate nearby ultracool dwarfs, including 12 late-M and L dwarfs likely to be within 20 pc of the Sun and 94 more distant late-type dwarfs. We have also identified five ultracool dwarfs with spectral signatures of low gravity. Combining these data with previous results, we define a sample of 99 ultracool dwarfs in 91 systems within 20 pc. These are used to estimate the J- and K-band luminosity functions for dwarfs with optical spectral types between M7 and L8 (10.5<MJ<15, 9.5<MKS<13). We find a space density of 4.9×10-3 pc-3 for late-M dwarfs (M7-M9.5) and a lower limit of 3.8×10-3 pc-3 for L dwarfs.

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Part 1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10    


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