Mixed-mode ensemble asteroseismology of low-luminosity Kepler red giants
We present measurements of the dipole mode asymptotic period spacing (ΔΠ1), the coupling factor between the p- and g-modes (q), the g-mode phase offset (ϵ g ), and the mixed-mode frequency rotational splitting (δ ν rot) for 1074 low-luminosity red giants from the Kepler mission. Using oscillation mo...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2023 September 10
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| In: |
The astrophysical journal
Year: 2023, Volume: 954, Issue: 2, Pages: 1-19 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ace598 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/ace598 Verlag, kostenfrei, Volltext: https://dx.doi.org/10.3847/1538-4357/ace598 
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| Author Notes: | James S. Kuszlewicz, Marc Hon, Daniel Huber |
| Summary: | We present measurements of the dipole mode asymptotic period spacing (ΔΠ1), the coupling factor between the p- and g-modes (q), the g-mode phase offset (ϵ g ), and the mixed-mode frequency rotational splitting (δ ν rot) for 1074 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 modeling of the mixed-mode frequencies. With our measurements, we show that the mode coupling factor q shows significant anticorrelation with both the 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 δ ν rot with the 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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| Item Description: | Gesehen am 06.12.2024 |
| Physical Description: | Online Resource |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ace598 |