197 Candidates and 104 Validated Planets in K2's First Five Fields
Ian J. M. Crossfield, David R. Ciardi, Erik A. Petigura, Evan, Sinukoff, Joshua E. Schlieder, Andrew W. Howard, Charles A. Beichman, Howard, Isaacson, Courtney D. Dressing, Jessie L. Christiansen, Benjamin J. Fulton,, S\'ebastien L\'epine, Lauren Weiss, Lea Hirsch

TL;DR
This paper reports the discovery and validation of 104 exoplanets from the K2 mission data, highlighting the increased detection of small planets around bright stars and emphasizing the importance of follow-up strategies.
Contribution
It presents a comprehensive catalog of K2 planet candidates and validated planets, with detailed analysis of their properties and validation process, expanding the known small planet population.
Findings
104 validated planets, including 37 smaller than 2 R_E
K2 increased small planet discoveries by 30% around bright stars
False positive rate estimated at 15-30% for candidates
Abstract
We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. We distill these candidates into sets of 104 validated planets (57 in multi-planet systems), 30 false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of R_P = 2.3 R_E, P=8.6 d, Tef = 5300 K, and Kp=12.7 mag. Stellar spectroscopy provides precise stellar and planetary parameters for most of these systems. We show that K2 has increased by 30% the number of small planets known to orbit moderately bright stars (1-4 R_E, Kp=9-13 mag). Of particular interest are 37 planets smaller than 2 R_E, 15 orbiting stars brighter than Kp=11.5, five receiving Earth-like irradiation…
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