论文标题
苔丝扩展任务10分钟的节奏保留Nyquist别名
TESS Extended Mission 10-Minute Cadence Retains Nyquist Aliases
论文作者
论文摘要
在其为期两年的主要任务中，传输系外行星调查卫星（TESS）正在以26个扇区的序列定期获得30分钟的节奏获得全帧图像，这些扇区覆盖了总占85％的天空。虽然其主要的科学案例是发现在附近恒星的新系外行星，但苔丝数据非常出色，用于研究多种类型的恒星变异性，并且出版物的数量使用苔丝数据用于其他天体物理学领域，以与外部纸张保持同步。在2020年7月的主要任务结束后，苔丝将在一个扩展的任务中重新审视天空，该任务以更快的十分钟节奏记录完整框架的图像。在本说明中，我证明，为新的节奏选择原始曝光时间的大幅度下时间限制了Prime和扩展苔丝任务数据之间的协同作用，因为两个采样率都会产生许多相同的Nyquist别名。将延长的任务曝光时间调整至一秒钟，将在很大程度上解决苔丝数据集中的nyquist歧义。
During its two-year prime mission, the Transiting Exoplanet Survey Satellite (TESS) is obtaining full-frame images with a regular 30-minute cadence in a sequence of 26 sectors that cover a combined 85% of the sky. While its primary science case is to discover new exoplanets transiting nearby stars, TESS data are superb for studying many types of stellar variability, with the number of publications using TESS data for other areas of astrophysics keeping pace with exoplanet papers. Following the conclusion of its prime mission in July 2020, TESS will revisit the sky in an extended mission that records full-frame images at a faster ten-minute cadence. In this note, I demonstrate that choosing a large submultiple of the original exposure times for the new cadence limits the synergy between prime and extended TESS mission data since both sampling rates produce many of the same Nyquist aliases. Adjusting the extended mission exposure time by as little as one second would largely resolve Nyquist ambiguities in the combined TESS data set.
