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

Petigura, Erik A. and Crossfield, Ian J. M. and Isaacson, Howard and Beichman, Charles A. and Christiansen, Jessie L. and Dressing, Courtney D. and Fulton, Benjamin J. and Howard, Andrew W. and Kosiarek, Molly R. and Lépine, Sébastien and Schlieder, Joshua E. and Sinukoff, Evan and Yee, Samuel W. (2018) Planet Candidates from K2 Campaigns 5–8 and Follow-up Optical Spectroscopy. Astronomical Journal, 155 (1). Art. No. 21. ISSN 1538-3881. doi:10.3847/1538-3881/aa9b83.

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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 ≈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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Petigura, Erik A.0000-0003-0967-2893
Crossfield, Ian J. M.0000-0002-1835-1891
Isaacson, Howard0000-0002-0531-1073
Beichman, Charles A.0000-0002-5627-5471
Christiansen, Jessie L.0000-0002-8035-4778
Dressing, Courtney D.0000-0001-8189-0233
Fulton, Benjamin J.0000-0003-3504-5316
Howard, Andrew W.0000-0001-8638-0320
Kosiarek, Molly R.0000-0002-6115-4359
Lépine, Sébastien0000-0002-2437-2947
Schlieder, Joshua E.0000-0001-5347-7062
Sinukoff, Evan0000-0002-5658-0601
Yee, Samuel W.0000-0001-7961-3907
Additional Information:© 2017. The American Astronomical Society. Received 2017 September 22; revised 2017 November 14; accepted 2017 November 14; published 2017 December 15. We thank the anonymous referee for a thoughtful reading of the manuscript and for useful suggestions. E.A.P. acknowledges support from Hubble Fellowship grant HST-HF2-51365.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. for NASA under contract NAS 5-26555. Work by C.D.D. was performed in part under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. This research used the computing resources of NERSC, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Finally, the authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have had the opportunity to conduct observations from this mountain. Software: batman (Kreidberg 2015), SpecMatch-Syn (Petigura 2015), SpecMatch-Emp (Yee et al. 2017), k2phot (, isoclassify (Huber et al. 2017), isochrones (Morton 2015).
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51365.001-A
NASANAS 5-26555
Department of Energy (DOE)DE-AC02-05CH11231
Subject Keywords:planetary systems; planets and satellites: detection; planets and satellites: fundamental parameters; stars: abundances; stars: fundamental parameters; techniques: spectroscopic
Issue or Number:1
Record Number:CaltechAUTHORS:20171214-143210781
Persistent URL:
Official Citation:Erik A. Petigura et al 2018 AJ 155 21
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83927
Deposited By: George Porter
Deposited On:14 Dec 2017 23:52
Last Modified:15 Nov 2021 20:15

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