CWISE J014611.20–050850.0AB: The Widest Known Brown Dwarf Binary in the Field
CWISE J014611.20–050850.0AB: The Widest Known Brown Dwarf Binary in the Field
复制标题
DOI：
10.3847/2041-8213/ac51d8
复制
发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
E. Softich;A. Schneider;J. Patience;A. Burgasser;E. Shkolnik;J. Faherty;D. Caselden;A. Meisner;J. Kirkpatrick;M. Kuchner;J. Gagné;D. B. Gagliuffi;M. Cushing;S. Casewell;C. Aganze;C. Hsu;Nikolaj Stevnbak Andersen;Frank Kiwy;M. Thévenot
中科院分区：
文献类型：
--
作者：
E. Softich;A. Schneider;J. Patience;A. Burgasser;E. Shkolnik;J. Faherty;D. Caselden;A. Meisner;J. Kirkpatrick;M. Kuchner;J. Gagné;D. B. Gagliuffi;M. Cushing;S. Casewell;C. Aganze;C. Hsu;Nikolaj Stevnbak Andersen;Frank Kiwy;M. Thévenot
虽然恒星经常在双星系统中被发现，但棕矮星双星要罕见得多。棕矮星-棕矮星对通常很难分辨，因为它们的间隔通常很小。利用广域红外探测探测器(WISE)通过后院世界：行星9公民科学项目发现的棕矮星的数据，我们检查了其他更高分辨率的天空观测，以寻找被忽视的寒冷伴星。在这个过程中，我们发现了棕矮星双星系统CWISE J0146−0508AB，基于该系统各组成部分相似的自行运动，我们发现它有很小的机会对准概率。利用KEK/NIRES的后续近红外光谱，我们确定了L4和L8(蓝色)的成分光谱类型，使CWISE J0146−0508AB成为为数不多的具有蓝色L矮星的基准系统之一。据估计，距离∼40PC的CWISE J0146−0508AB预计分离∼129Au，使其成为迄今发现的分离最宽的棕矮星对。我们发现，棕矮星双星如此大的距离可能意味着在低密度恒星形成区形成。
While stars are often found in binary systems, brown dwarf binaries are much rarer. Brown dwarf–brown dwarf pairs are typically difficult to resolve because they often have very small separations. Using brown dwarfs discovered with data from the Wide-field Infrared Survey Explorer (WISE) via the Backyard Worlds: Planet 9 citizen science project, we inspected other, higher-resolution, sky surveys for overlooked cold companions. During this process, we discovered the brown dwarf binary system CWISE J0146−0508AB, which we find has a very small chance alignment probability based on the similar proper motions of the components of the system. Using follow-up near-infrared spectroscopy with Keck/NIRES, we determined component spectral types of L4 and L8 (blue), making CWISE J0146−0508AB one of only a few benchmark systems with a blue L dwarf. At an estimated distance of ∼40 pc, CWISE J0146−0508AB has a projected separation of ∼129 au, making it the widest-separation brown dwarf pair found to date. We find that such a wide separation for a brown dwarf binary may imply formation in a low-density star-forming region.