Publications (1)0 Total impact
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Edward L. Wright,
M. F. Skrutskie,
J. Davy Kirkpatrick,
Christopher R. Gelino,
Roger L. Griffith,
Kenneth A. Marsh, Tom Jarrett,
M. J. Nelson,
H. J. Borish,
Gregory Mace,
Amanda K. Mainzer,
Peter R. Eisenhardt,
Ian S. McLean,
John J. Tobin,
Michael C. Cushing
[show abstract]
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ABSTRACT: 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 arc-min, and the projected physical separation is about 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
Jupiter masses for system ages of 2 and 8 Gyr respectively.
03/2012;
