The Derivation, Properties, and Value of Kepler’s Combined Differential Photometric Precision
Abstract
The Kepler Mission is searching for Earthsize planets orbiting solarlike 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 pertarget basis for 3, 6, and 12hr 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.
 Publication:

Publications of the Astronomical Society of the Pacific
 Pub Date:
 December 2012
 DOI:
 10.1086/668847
 arXiv:
 arXiv:1208.0595
 Bibcode:
 2012PASP..124.1279C
 Keywords:

 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 24 pages, 12 figures, submitted to PASP