A T8.5 BROWN DWARF MEMBER OF THE {xi} URSAE MAJORIS SYSTEM

Journal Article · Fri Mar 15 00:00:00 EDT 2013 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/145/3/84· OSTI ID:22130859

Wright, Edward L.; Mace, Gregory; McLean, Ian S. ^[1]; Skrutskie, M. F.; Nelson, M. J.; Borish, H. J. ^[2]; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Jarrett, Tom ^[3]; Marsh, Kenneth A. ^[4]; Mainzer, Amanda K.; Eisenhardt, Peter R. ^[5]; Tobin, John J. ^[6]

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1. UCLA Astronomy, P.O. Box 951547, Los Angeles, CA 90095-1547 (United States)
2. Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
3. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)
4. School of Physics and Astronomy, Cardiff University, Cardiff CF243AA (United Kingdom)
5. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8001 (United States)
6. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)

The Wide-field Infrared Survey Explorer has revealed a T8.5 brown dwarf (WISE J111838.70+312537.9) that exhibits common proper motion with a solar-neighborhood (8 pc) quadruple star system-{xi} Ursae Majoris. The angular separation is 8.'5, and the projected physical separation is Almost-Equal-To 4000 AU. The sub-solar metallicity and low chromospheric activity of {xi} UMa A argue that the system has an age of at least 2 Gyr. The infrared luminosity and color of the brown dwarf suggests the mass of this companion ranges between 14 and 38 M{sub J} for system ages of 2 and 8 Gyr, respectively.

• OSTI ID: 22130859
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 145, Issue 3; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COLOR
INFRARED SURVEYS
LUMINOSITY
MASS
PROPER MOTION
STARS