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- W3099383823 abstract "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." @default.
- W3099383823 created "2020-11-23" @default.
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- W3099383823 date "2020-04-30" @default.
- W3099383823 modified "2023-10-16" @default.
- W3099383823 title "An Isolated White Dwarf with 317 s Rotation and Magnetic Emission" @default.
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- W3099383823 doi "https://doi.org/10.3847/1538-4357/ab8239" @default.
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