Papers › Mixed-mode Ensemble Asteroseismology of Low-Luminosity Kepler Red Giants
Mixed-mode Ensemble Asteroseismology of Low-Luminosity Kepler Red Giants
James S. Kuszlewicz, Marc Hon, Daniel Huber
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We present measurements of the dipole mode asymptotic period spacing (ΔΠ₁), the coupling factor between p- and g- modes (q), the g-mode phase offset (ϵ_g), and the mixed-mode frequency rotational splitting (δνᵣₒₜ) for 1,074 low-luminosity red giants from the Kepler mission. Using oscillation mode frequencies extracted from each star, we apply Bayesian optimization to estimate ΔΠ₁ from the power spectrum of the stretched period spectrum and to perform the subsequent forward modelling of the mixed-mode frequencies. With our measurements, we show that the mode coupling factor q shows significant anti-correlation with both stellar mass and metallicity, and can reveal highly metal-poor stars. We present the evolution of ϵ_g up the lower giant branch up to before the luminosity bump, and find no significant trends in ϵ_g or δνᵣₒₜ with stellar mass and metallicity in our sample. Additionally, we identify six new red giants showing anomalous distortions in their g-mode pattern. Our data products, code, and results are provided in a public repository.
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