论文标题
孤立的白色矮人，旋转317秒和磁发射
An Isolated White Dwarf with 317-Second Rotation and Magnetic Emission
论文作者
论文摘要
我们报告了SDSSJ125230.93-023417.72（EPIC 228939929）中的短期光度变异性和模拟的Zeeman分解氢发射的模型，可变的白色DWARF恒星，在\ textit {k2 {k2} caption 10. $ b = in PARIPATION 10。表面，使$ 317.278 $ - 第二个时期直接测量了恒星旋转速率。因此，该对象是尚未发现的白色矮人（无恒星伴侣）的最快旋转（无恒星伴侣），第二个物体在GD 356后发现了第二个具有色层Balmer发射，其中发射已归因于由可能的岩石行星驱动的单极电感机制。我们探讨了该对象的特性和行为，并考虑其进化是否可能对白矮人合并及其残余物具有影响。
We report the discovery of short-period photometric variability and modulated Zeeman-split hydrogen emission in SDSSJ125230.93-023417.72 (EPIC 228939929), a variable white dwarf star observed at long cadence in \textit{K2} Campaign 10. The behavior is associated with a magnetic ($B=5.0$ MG) spot on the stellar surface, making the $317.278$-second period a direct measurement of the stellar rotation rate. This object is therefore the fastest-rotating apparently isolated (without a stellar companion) white dwarf yet discovered, and the second found to exhibit chromospheric Balmer emission after GD 356, in which the emission has been attributed to a unipolar inductor mechanism driven by a possible rocky planet. We explore the properties and behavior of this object, and consider whether its evolution may hold implications for white dwarf mergers and their remnants.
