Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25

摘要

We present the Kepler Object of Interest (KOI) catalog of transitingexoplanets based on searching four years of Kepler time series photometry (DataRelease 25, Q1--Q17). The catalog contains 8054 KOIs of which 4034 are planetcandidates with periods between 0.25 and 632 days. Of these candidates, 219 arenew in this catalog and include two new candidates in multi-planet systems(KOI-82.06 and KOI-2926.05), and ten new high-reliability, terrestrial-size,habitable zone candidates. This catalog was created using a tool called theRobovetter which automatically vets the DR25 Threshold Crossing Events (TCEs)found by the Kepler Pipeline Twicken et al. (2016). Because of this automation,we were also able to vet simulated data sets and therefore measure how well theRobovetter separates those TCEs caused by noise from those caused by lowsignal-to-noise transits. Because of these measurements we fully expect thatthis catalog can be used to accurately calculate the frequency of planets outto Kepler's detection limit, which includes temperate, super-Earth size planetsaround GK dwarf stars in our Galaxy. This paper discusses the Robovetter andthe metrics it uses to decide which TCEs are called planet candidates in theDR25 KOI catalog. We also discuss the simulated transits, simulated systematicnoise, and simulated astrophysical false positives created in order tocharacterize the properties of the final catalog. We describe how we measurethe completeness and reliability and how they vary with period,signal-to-noise, number of transits, and stellar type. Also, we discuss a valuecalled the disposition score which provides an easy way to select a morereliable, albeit less complete, sample of candidates. The entire KOI catalogand all of the simulated data used to characterize this catalog are availableat the NASA Exoplanet Archive.