Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii

By Jie Yu, D. Huber, T. Bedding, D. Stello, M. Hon, S. Murphy, S. Khanna. Astrophysical Journal Supplement Series, 2018

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The Kepler mission has provided exquisite data to perform an ensemble asteroseismic analysis on evolved stars. In this work we systematically characterize solar-like oscillations and granulation for 16,094 oscillating red giants, using end-of-mission long-cadence data. We produced a homogeneous catalog of the frequency of maximum power (typical uncertainty ), the mean large frequency separation ( ), oscillation amplitude ( ), granulation power ( ), power excess width ( ), seismically derived stellar mass ( ), radius ( ), and thus surface gravity ( dex). Thanks to the large red giant sample, we confirm that red-giant-branch (RGB) and helium-core-burning (HeB) stars collectively differ in the distribution of oscillation amplitude, granulation power, and width of power excess, which is mainly due to the mass difference. The distribution of oscillation amplitudes shows an extremely sharp upper edge at fixed , which might hold clues for understanding the excitation and damping mechanisms of the oscillation modes. We find that both oscillation amplitude and granulation power depend on metallicity, causing a spread of 15% in oscillation amplitudes and a spread of 25% in granulation power from [Fe/H] = −0.7 to 0.5 dex. Our asteroseismic stellar properties can be used as reliable distance indicators and age proxies for mapping and dating galactic stellar populations observed by Kepler. They will also provide an excellent opportunity to test asteroseismology using Gaia parallaxes, and lift degeneracies in deriving atmospheric parameters in large spectroscopic surveys such as APOGEE and LAMOST.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/33eea8ad89f7057eebc7f32ec3380047d049ca5b

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Citations in the corpus

A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS) (2018, background): “However, Kepler observed roughly 16,000 red giants (Yu et al. 2018) and found only a handful of planets.”
The Payne: Self-consistent ab initio Fitting of Stellar Spectra (2018, background): “It is conceivable that differences in helium abundance between the RGB stars and the red clump stars could explain the glog discrepancy (e.g., Yu et al. 2018).”
Confirmation of the Gaia DR2 Parallax Zero-point Offset Using Asteroseismology and Spectroscopy in the Kepler Field (2018, background): “Solar-like oscillations have been detected in thousands of evolved stars by the CoRoT and Kepler missions (De Ridder et al. 2009; Hekker et al. 2009; Bedding et al. 2010; Stello et al. 2013; Yu et al. 2018).”