Planet Masses, Radii, and Orbits from NASA's K2 Mission
Abstract
We report the masses, sizes, and orbital properties of 86 planets orbiting 55 stars observed by NASA's K2 Mission with follow-up Doppler measurements by the HIRES spectrometer at the W. M. Keck Observatory and the Automated Planet Finder at Lick Observatory. Eighty-one of the planets were discovered from their transits in the K2 photometry, while five were found based on subsequent Doppler measurements of transiting planet host stars. The sizes of the transiting planets range from Earth-size to larger than Jupiter (1-3 REarth is typical), while the orbital periods range from less than a day to a few months. For 32 of the planets, the Doppler signal was detected with significance greater than 5-sigma (51 were detected with >3-sigma significance). An important characteristic of this catalog is the use of uniform analysis procedures to determine stellar and planetary properties. This includes the transit search and fitting procedures applied to the K2 photometry, the Doppler fitting techniques applied to the radial velocities, and the spectral modeling to determine bulk stellar parameters. Such a uniform treatment will make the catalog useful for statistical studies of the masses, densities, and system architectures of exoplanetary systems. This work also serves as a data release for all previously unpublished RVs and associated stellar activity indicators obtained by our team for these systems, along with derived stellar and planet parameters.
Cite
@article{arxiv.2502.04436,
title = {Planet Masses, Radii, and Orbits from NASA's K2 Mission},
author = {Andrew W. Howard and Evan Sinukoff and Sarah Blunt and Erik A. Petigura and Ian J. M. Crossfield and Howard Isaacson and Molly Kosiarek and Ryan A. Rubenzahl and John M. Brewer and Benjamin J. Fulton and Courtney D. Dressing and Lea A. Hirsch and Heather Knutson and John H. Livingston and Sean M. Mills and Arpita Roy and Lauren M. Weiss and Bjorn Benneke and David R. Ciardi and Jessie L. Christiansen and William D. Cochran and Justin R. Crepp and Erica Gonzales and Brad M. S. Hansen and Kevin Hardegree-Ullman and Steve B. Howell and Sébastien Lépine and Arturo O. Martinez and Leslie A. Rogers and Joshua E. Schlieder and Michael Werner and Alex S. Polanski and Isabel Angelo and Corey Beard and Aida Behmard and Luke G. Bouma and Casey L. Brinkman and Ashley Chontos and Fei Dai and Paul A. Dalba and Steven Giacalone and Samuel K. Grunblatt and Michelle L. Hill and Stephen R. Kane and Jack Lubin and Andrew W. Mayo and Teo Mocnik and Joseph M. Akana Murphy and Malena Rice and Lee J. Rosenthal and Dakotah Tyler and Judah Van Zandt and Samuel W. Yee},
journal= {arXiv preprint arXiv:2502.04436},
year = {2025}
}
Comments
156 pages, 86 planets, 55 stars, 104 figures, 48 tables. Accepted to ApJS