开普勒K2眼中有趣的极地EU巨蟹座
The Intriguing Polar EU Cancri in the Eyes of Kepler K2
摘要：
我们提出的光变曲线的欧盟数控，第一次公布的分析开普勒光变曲线的极地。虽然EU Cnc在第16和18次活动期间非常微弱，但它的光变曲线显示出一个大幅度的脉冲，持续了每个轨道的一半，我们解释为来自吸积区域的光，该区域在白矮星的边缘后面旋转了一半的轨道。值得注意的是，脉搏曲线在两次运动中都没有明显的变化。此外，我们注意到在轨道驼峰的开始和结束处有不明原因的弱倾角，深度约为10%。K2的波形与之前报道的轨道时间尺度上的所有变化一致，这表明EU Cnc在其整个观测历史中可能处于相同的低状态。然后，我们探讨的可能性，欧盟数控的不寻常的低传质速率和一致的光变曲线的组合表明，欧盟数控可能是一个低吸积率极地（LARP）的可能性。
英文摘要：
We present the light curve of EU Cnc, the first published analysis of a Kepler light curve of a polar. Although EU Cnc was extremely faint during campaign 16 and 18 its light curve showed a large-amplitude pulse that lasted for half of each orbit, which we interpret to be light from an accretion region that rotates behind the limb of the white dwarf for half of the orbit. Remarkably, the pulse profile showed no appreciable variability in either campaign. Additionally, we note weak dips of unknown origin with a depth of ~10% at the beginning and end of the orbital hump. The K2 waveform is consistent with all previously reported variations on the orbital timescale, suggesting that EU Cnc has possibly been at the same low state for its entire observational history. We then explore the possibility that EU Cnc's unusual combination of a low mass-transfer rate and consistent light curve indicates the possibility that EU Cnc might be a low-accretion-rate polar (LARP).
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