학술논문
Sixty Validated Planets from K2 Campaigns 5–8
Document Type
article
Author
Livingston, John H; Crossfield, Ian JM; Petigura, Erik A; Gonzales, Erica J; Ciardi, David R; Beichman, Charles A; Christiansen, Jessie L; Dressing, Courtney D; Henning, Thomas; Howard, Andrew W; Isaacson, Howard; Fulton, Benjamin J; Kosiarek, Molly; Schlieder, Joshua E; Sinukoff, Evan; Tamura, Motohide
Source
The Astronomical Journal. 156(6)
Subject
Language
Abstract
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 = 2.5 R Å , 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 R Å , 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.