Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II. Radii, Masses, and Ages

By V. S. Aguirre, M. Lund, H. M. Antia, W. Ball, S. Basu, J. Christensen-Dalsgaard, Y. Lebreton, D. Reese, K. Verma, Luca Casagrande and 14 more. 2016

206 citations recorded by the source corpus.

We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission. We distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied different methods to determine radii, masses, and ages for all stars in the sample. Comparisons among the different results reveal a good level of agreement in all stellar properties, which is remarkable considering the variety of codes, input physics, and analysis methods employed by the different teams. Average uncertainties are of the order of ∼2% in radius, ∼4% in mass, and ∼10% in age, making this the best-characterized sample of main-sequence stars available to date. Our predicted initial abundances and mixing-length parameters are checked against inferences from chemical enrichment laws ΔY/ΔZ and predictions from 3D atmospheric simulations. We test the accuracy of the determined stellar properties by comparing them to the Sun, angular diameter measurements, Gaia parallaxes, and binary evolution, finding excellent agreement in all cases and further confirming the robustness of asteroseismically determined physical parameters of stars when individual frequencies of oscillation are available. Baptised as the Kepler dwarfs LEGACY sample, these stars are the solar-like oscillators with the best asteroseismic properties available for at least another decade. All data used in this analysis and the resulting stellar parameters are made publicly available for the community.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/8b9239662c2be38b0b0700ccb9de4752dcc20957

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Citations in the corpus

• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes (2017, result): “However, subsequent work by Silva Aguirre et al. (2017) using a sample of ≈60 nearby dwarfs revealed a systematic offset between TGAS and asteroseismology, in agreement with results from eclipsing binaries by Stassun & Torres (2016b) and ground-based parallaxes for dwarfs at <25 pc (Jao et al. 2016)”
• The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars (2017, result): “Similar offsets were also reported by Jao et al. (2016), who compared TGAS parallaxes to literature values of nearby stars, and by Silva Aguirre et al. (2017), who compared TGAS parallaxes against asteroseismic parallaxes for 66 main-sequence stars.”
• The Gaia–Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars (2020, methodology): “We utilized the “boutique” frequency-modeled ages from the Kepler legacy sample detailed in Silva Aguirre et al. (2017), which includes results from a number of analysis pipelines.”