A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System
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
TL;DR
This paper reports the discovery of a T8.5 brown dwarf sharing proper motion with the Xi Ursae Majoris star system, providing insights into its properties and system age.
Contribution
It identifies a new brown dwarf companion to a nearby star system and characterizes its physical properties and potential mass range.
Findings
Brown dwarf shares proper motion with Xi Ursae Majoris system.
Estimated brown dwarf mass ranges from 14 to 38 Jupiter masses.
System age is at least 2 billion years.
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.
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