A T8.5 BROWN DWARF MEMBER OF THE ξ URSAE MAJORIS SYSTEM
A T8.5 BROWN DWARF MEMBER OF THE ξ URSAE MAJORIS SYSTEM
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大熊座 Ψ 星系的 T8.5 棕矮星成员
DOI：
10.1088/0004-6256/145/3/84
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Cushing
中科院分区：
文献类型：
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作者：
E. Wright;M. Skrutskie;J. Kirkpatrick;C. Gelino;R. Griffith;K. Marsh;T. Jarrett;M. Nelson;H. J. Borish;G. Mace;A. Mainzer;P. Eisenhardt;I. McLean;J. Tobin;M. Cushing
宽视场红外巡天探测器发现了一颗T8.5褐矮星（WISE J111838.70+312537.9），它表现出与太阳邻域（8 pc）四重星星系统-大熊座共同的自行。角距为8.′5，投影物理距离为4000 Au。太阳下的金属丰度和低色球层活动表明，该系统的年龄至少为2 Gyr。褐矮星的红外光度和颜色表明，这颗伴星的质量范围在14到38 MJ之间，系统年龄分别为2和8 Gyr。
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—ξ Ursae Majoris. The angular separation is 8.′5, and the projected physical separation is ≈4000 AU. The sub-solar metallicity and low chromospheric activity of ξ 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 MJ for system ages of 2 and 8 Gyr, respectively.