摘要：We present a uniform analysis of 155 candidates from the second year of NASA’s K2 mission (Campaigns 5–8), yielding 60 statistically validated planets spanning a range of properties with median values of R p = Å R 2.5 , P= 7.1 days, T eq = 811 K, and J= 11.3 mag. The sample includes 24 planets in 11 multiplanetary systems, as well as 18 false positives and 77 remaining planet candidates. Of particular interest are 18 planets smaller than 2 Å R , five orbiting stars brighter than J=10 mag, and a system of four small planets orbiting the solar-type star EPIC 212157262. We compute planetary transit parameters and false-positive probabilities using a robust statistical framework and present a complete analysis incorporating the results of an intensive campaign of high-resolution imaging and spectroscopic observations. This work brings the K2 yield to over 360 planets, and by extrapolation, we expect that K2 will have discovered ∼600 planets before the expected depletion of its onboard fuel in late 2018.
关键词：planets and satellites: detection;techniques: photometric
