A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System

Details A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System

2012-03-26

arxiv.org/abs/1203.5764v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

submitted to the AJ, 9 pages LaTeX with 5 figures

Scientific paper

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 28 and 58 Jupiter masses for system ages of 2 and 8 Gyr respectively.

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