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Title: WISEP J061135.13–041024.0 AB: A J-band flux reversal binary at the L/T transition

We present Keck II laser guide star adaptive optics observations of the brown dwarf WISEP J061135.13–041024.0 showing it is a binary with a component separation of 0.''4. This system is one of the six known resolved binaries in which the magnitude differences between the components show a reversal in sign between the Y/J band and the H/K bands. Deconvolution of the composite spectrum results in a best-fit binary solution with L9 and T1.5 components. We also present a preliminary parallax placing the system at a distance of 21.2 ± 1.3 pc. Using the distance and resolved magnitudes we are able to place WISEP J061135.13–041024.0 AB on a color-absolute magnitude diagram, showing that this system contributes to the well-known 'J-band bump' and the components' properties appear similar to other late-type L and early-type T dwarfs. Fitting our data to a set of cloudy atmosphere models suggests the system has an age >1 Gyr with WISE 0611–0410 A having an effective temperature (T {sub eff}) of 1275-1325 K and mass of 64-65 M {sub Jup}, and WISE 0611–0410 B having T {sub eff} = 1075-1115 K and mass 40-65 M {sub Jup}.
 [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. NASA Exoplanet Science Institute, Mail Code 100-22, California Institute of Technology, 770 South Wilson Avenue, Pasadena, CA 91125 (United States)
  2. Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese (Italy)
  3. Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom)
  4. Infrared Processing and Analysis Center, Mail Code 100-22, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States)
  5. Department of Physics and Astronomy, MS 111, University of Toledo, 2801 W. Bancroft Street, Toledo, OH 43606-3328 (United States)
  6. Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Box 951547, Los Angeles, CA 90095-1547 (United States)
  7. Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago (Chile)
  8. School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
Publication Date:
OSTI Identifier:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States