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

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arxiv 1711.06377 v1 pith:3OXLGEGZ submitted 2017-11-17 astro-ph.EP

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

Erik A. Petigura , Ian J. M. Crossfield , Howard Isaacson , Charles A. Beichman , Jessie L. Christiansen , Courtney D. Dressing , Benjamin J. Fulton , Andrew W. Howard
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Molly R. Kosiarek S\'ebastien L\'epine Joshua E. Schlieder Evan Sinukoff Samuel W. Yee
This is my paper
classification astro-ph.EP
keywords planetbinariescandidatesradiiapproxcampaignseclipsingfollow-up
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $\approx$10% precision, compared to $\approx$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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