Planet Candidates from K2 Campaigns 5-8 and Follow-Up Optical Spectroscopy
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.
Original · EN
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.
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