Astron. J., 153, 136-136 (2017/March-0)
Accurate empirical radii and masses of planets and their host stars with Gaia parallaxes.
STASSUN K.G., COLLINS K.A. and GAUDI B.S.
Abstract (from CDS):
We present empirical measurements of the radii of 116 stars that host transiting planets. These radii are determined using only direct observables-the bolometric flux at Earth, the effective temperature, and the parallax provided by the Gaia first data release-and thus are virtually model independent, with extinction being the only free parameter. We also determine each star's mass using our newly determined radius and the stellar density, a virtually model independent quantity itself from previously published transit analyses. These stellar radii and masses are in turn used to redetermine the transiting-planet radii and masses, again using only direct observables. The median uncertainties on the stellar radii and masses are 8% and 30%, respectively, and the resulting uncertainties on the planet radii and masses are 9% and 22%, respectively. These accuracies are generally larger than previously published model-dependent precisions of 5% and 6% on the planet radii and masses, respectively, but the newly determined values are purely empirical. We additionally report radii for 242 stars hosting radial-velocity (non-transiting) planets, with a median achieved accuracy of ≃2%. Using our empirical stellar masses we verify that the majority of putative "retired A stars" in the sample are indeed more massive than ∼1.2 M☉. Most importantly, the bolometric fluxes and angular radii reported here for a total of 498 planet host stars-with median accuracies of 1.7% and 1.8%, respectively-serve as a fundamental data set to permit the re-determination of transiting-planet radii and masses with the Gaia second data release to ≃3% and ≃5% accuracy, better than currently published precisions, and determined in an entirely empirical fashion.
© 2017. The American Astronomical Society. All rights reserved.
astronomical databases: miscellaneous - methods: data analysis - planets and satellites: fundamental parameters - stars: fundamental parameters - stars: fundamental parameters
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<Available at CDS (J/AJ/153/136): table4.dat table5.dat table6.dat table7.dat>
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