EVEREST K2管道的更新：短节奏、饱和星型和开普勒型photometry，Kp = 15
An update to the EVEREST K2 pipeline: Short cadence, saturated stars, and Kepler-like photometry down to Kp = 15
摘要：
我们对EVEREST K2管道进行了更新，解决了以前版本中的各种限制，并提高了去趋势光变曲线的光度精度。我们开发了一种快速正则化方案的三阶像素级去相关（PLD）和适应算法，包括相邻恒星的PLD向量，以提高模型的预测能力，并尽量减少过拟合，特别是对于微弱的恒星。我们还对PLD进行了改进，使其适用于饱和星，并提高了它在极变星上的性能。平均而言，EVEREST 2.0光变曲线的光度精度比以前的版本高10-20%，在任何公开的K2星表中，在所有Kp星等下产生的光变曲线精度最高。对于大多数K2运动，我们将原始开普勒精度恢复到至少Kp = 14，对于运动1，5和6至少Kp = 15。我们还对K2观测到的所有短节奏目标进行了去趋势化，为这些恒星获得了更高的光度精度。活动0-8的所有光变曲线都可以在EVEREST目录中在线获得，该目录将随着未来的活动不断更新。EVEREST 2.0是开源的，并在一个通用框架中编码，可应用于其他光度测量，包括开普勒和即将到来的TESS任务。
英文摘要：
We present an update to the EVEREST K2 pipeline that addresses various limitations in the previous version and improves the photometric precision of the de-trended light curves. We develop a fast regularization scheme for third order pixel level decorrelation (PLD) and adapt the algorithm to include the PLD vectors of neighboring stars to enhance the predictive power of the model and minimize overfitting, particularly for faint stars. We also modify PLD to work for saturated stars and improve its performance on extremely variable stars. On average, EVEREST 2.0 light curves have 10-20% higher photometric precision than those in the previous version, yielding the highest precision light curves at all Kp magnitudes of any publicly available K2 catalog. For most K2 campaigns, we recover the original Kepler precision to at least Kp = 14, and to at least Kp = 15 for campaigns 1, 5, and 6. We also de-trend all short cadence targets observed by K2, obtaining even higher photometric precision for these stars. All light curves for campaigns 0-8 are available online in the EVEREST catalog, which will be continuously updated with future campaigns. EVEREST 2.0 is open source and is coded in a general framework that can be applied to other photometric surveys, including Kepler and the upcoming TESS mission.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
