论文标题
HP Librae的K2 Lightcurve的周期性
Periodicities in the K2 lightcurve of HP Librae
论文作者
论文摘要
我们分析了AM CVN系统HP Librae的Kepler/K2 LightCurve数据。我们在系统中置信度四个光度周期性检测：轨道频率，正和负超烟，以及积聚盘的正Apsidal promession频率。这是在SDSS J135154.46-064309.0之后第二次直接在氦气系统的光度法中直接检测到Apsidal进动频率。我们提出了四个周期性中每个周期性的相位折叠的光曲面和滑动功率谱。我们衡量$ 10^{ - 7} $ DAME/DAME的正面超级人口的变化率。我们还以300 cyc/天重新检测QPO，该功能在数十年中一直稳定，并表明它与另外两个QPO在谐音上相关，其中最低的QPO以超hump/轨道频率为中心。连续功率谱与单个功率定律一致，没有证据表明我们观察到的频率范围内有任何断裂。
We analyse Kepler/K2 lightcurve data of the AM CVn system HP Librae. We detect with confidence four photometric periodicities in the system: the orbital frequency, both positive and negative superhumps, and the positive apsidal precession frequency of the accretion disc. This is only the second time that the apsidal precession frequency has ever been directly detected in the photometry of a helium accreting system, after SDSS J135154.46-064309.0. We present phase-folded lightcurves and sliding power spectra of each of the four periodicities. We measure rates of change of the positive superhump period of $10^{-7}$ days/day. We also redetect a QPO at 300 cyc/day, a feature that has been stable over decades, and show that it is harmonically related to two other QPOs, the lowest of which is centered on the superhump/orbital frequency. The continuum power spectrum is consistent with a single power law with no evidence of any breaks within our observed frequency range.
