The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars

John Asher Johnson, Erik A. Petigura, Benjamin J. Fulton, Geoffrey W. Marcy, Andrew W. Howard, Howard Isaacson, Leslie Hebb, Phillip A. Cargile, Timothy D. Morton, Lauren M. Weiss, Joshua N. Winn, Leslie A. Rogers, Evan Sinukoff, Lea A. Hirsch

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


We present stellar and planetary properties for 1305 Kepler Objects of Interest hosting 2025 planet candidates observed as part of the California-Kepler Survey. We combine spectroscopic constraints, presented in Paper I, with stellar interior modeling to estimate stellar masses, radii, and ages. Stellar radii are typically constrained to 11%, compared to 40% when only photometric constraints are used. Stellar masses are constrained to 4%, and ages are constrained to 30%. We verify the integrity of the stellar parameters through comparisons with asteroseismic studies and Gaia parallaxes. We also recompute planetary radii for 2025 planet candidates. Because knowledge of planetary radii is often limited by uncertainties in stellar size, we improve the uncertainties in planet radii from typically 42% to 12%. We also leverage improved knowledge of stellar effective temperature to recompute incident stellar fluxes for the planets, now precise to 21%, compared to a factor of two when derived from photometry.

Original languageEnglish (US)
Article number108
JournalAstronomical Journal
Issue number3
StatePublished - Sep 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planets and satellites: fundamental parameters
  • planets and satellites: general
  • stars: abundances
  • stars: fundamental parameters
  • techniques: spectroscopic


Dive into the research topics of 'The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars'. Together they form a unique fingerprint.

Cite this