TL;DR
This paper uses Gaia DR2 data to significantly improve the radii estimates of Kepler stars and exoplanets, refining stellar classifications and revealing new insights into planet populations and their distributions.
Contribution
It provides revised stellar radii for Kepler stars with improved precision and recalculates exoplanet sizes, revealing updated features in planet distributions and habitable zone candidates.
Findings
Median radius precision improved to approximately 8%.
Most Kepler targets are main-sequence stars, with fewer subgiants and giants.
Confirmed a radius gap in small, close-in planets at incident fluxes > 200F_⊕.
Abstract
One bottleneck for the exploitation of data from the mission for stellar astrophysics and exoplanet research has been the lack of precise radii and evolutionary states for most of the observed stars. We report revised radii of 177,911 stars derived by combining parallaxes from Data Release 2 with the DR25 Stellar Properties Catalog. The median radius precision is 8%, a typical improvement by a factor of 4-5 over previous estimates for typical stars. We find that 67% ( 120,000) of all targets are main-sequence stars, 21% ( 37,000) are subgiants, and 12% ( 21,000) are red giants, demonstrating that subgiant contamination is less severe than some previous estimates and that Kepler targets are mostly main-sequence stars. Using the revised stellar radii, we recalculate the…
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