Planet Candidates from K2 Campaigns 5-8 and Follow-up Optical Spectroscopy

January 2018 • 2018AJ....155...21P

Authors • Petigura, Erik A. • Crossfield, Ian J. M. • Isaacson, Howard • Beichman, Charles A. • Christiansen, Jessie L. • Dressing, Courtney D. • Fulton, Benjamin J. • Howard, Andrew W. • Kosiarek, Molly R. • Lépine, Sébastien • Schlieder, Joshua E. • Sinukoff, Evan • Yee, Samuel W.

Abstract • We present 151 planet candidates orbiting 141 stars from K2 campaigns 5-8 (C5-C8), identified through a systematic search of K2 photometry. In addition, we identify 16 targets as likely eclipsing binaries, based on their light curve morphology. We obtained follow-up optical spectra of 105/141 candidate host stars and 8/16 eclipsing binaries to improve stellar properties and to identify spectroscopic binaries. Importantly, spectroscopy enables measurements of host star radii with ≈10% precision, compared to ≈40% precision when only broadband photometry is available. The improved stellar radii enable improved planet radii. Our curated catalog of planet candidates provides a starting point for future efforts to confirm and characterize K2 discoveries.


IPAC Authors


Jessie Christiansen

Associate Scientist


Benjamin Fulton

Assistant Scientist