Planet Candidates from K2 Campaigns 5–8 and Follow-up Optical Spectroscopy
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.
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 (https://github.com/petigura/k2phot), isoclassify (Huber et al. 2017), isochrones (Morton 2015).Attached Files
Published - Petigura_2018_AJ_155_21.pdf
Submitted - 1711.06377.pdf
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Additional details
- Eprint ID
- 83927
- Resolver ID
- CaltechAUTHORS:20171214-143210781
- HST-HF2-51365.001-A
- NASA Hubble Fellowship
- NAS 5-26555
- NASA
- NASA Sagan Fellowship
- DE-AC02-05CH11231
- Department of Energy (DOE)
- Created
-
2017-12-14Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC), Astronomy Department