The Derivation, Properties, and Value of Kepler's Combined Differential Photometric Precision
The Derivation, Properties, and Value of Kepler's Combined Differential Photometric Precision
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DOI：
10.1086/668847
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发表时间：
2012-12-01
影响因子：
3.5
通讯作者：
Van Cleve, Jeffrey
中科院分区：
文献类型：
--
作者：
Christiansen, Jessie L.;Jenkins, Jon M.;Van Cleve, Jeffrey
开普勒使命通过同时观测超过160000颗恒星来探测光度光变曲线中的凌日事件序列，以寻找围绕类太阳恒星运行的地球大小的行星。组合差分光度精度（CDPP）是定义这些微弱的地面凌日特征是否容易被检测到的度量标准。对CDPP的理解对于评估开普勒巡天的完整性和推断潜在的行星人口是非常宝贵的。本文介绍了如何计算开普勒CDPP，并介绍了3，6，和12小时的过境持续时间，现在可用于所有开普勒观测的每个目标的均方根CDPP表。第三季度是第一个典型的一个季度的名义长度和完整性的观察，从2009年9月18日至2009年12月16日，我们研究了该数据集的均方根CDPP分布的属性。最后，我们描述了如何使用CDPP来计算目标完整性，这是一个重要的用例。
The Kepler Mission is searching for Earth-size planets orbiting solar-like stars by simultaneously observing > 160, 000 stars to detect sequences of transit events in the photometric light curves. The Combined Differential Photometric Precision (CDPP) is the metric that defines the ease with which these weak terrestrial transit signatures can be detected. An understanding of CDPP is invaluable for evaluating the completeness of the Kepler survey and inferring the underlying planet population. This paper describes how the Kepler CDPP is calculated, and introduces tables of rms CDPP on a per-target basis for 3-, 6-, and 12-hr transit durations, which are now available for all Kepler observations. Quarter 3 is the first typical set of observations at the nominal length and completeness for a quarter, from 2009 September 18 to 2009 December 16, and we examine the properties of the rms CDPP distribution for this data set. Finally, we describe how to employ CDPP to calculate target completeness, an important use case.