Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants
We present measurements of the dipole mode asymptotic period spacing (ΔΠ _1 ), 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 o...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ace598 |
| _version_ | 1797728996197138432 |
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| author | James S. Kuszlewicz Marc Hon Daniel Huber |
| author_facet | James S. Kuszlewicz Marc Hon Daniel Huber |
| author_sort | James S. Kuszlewicz |
| collection | DOAJ |
| description | We present measurements of the dipole mode asymptotic period spacing (ΔΠ _1 ), 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 ΔΠ _1 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. |
| first_indexed | 2024-03-12T11:22:23Z |
| format | Article |
| id | doaj.art-e000b77fbc404e44a13b2e7d110d8a55 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T11:22:23Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-e000b77fbc404e44a13b2e7d110d8a552023-09-01T17:54:04ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01954215210.3847/1538-4357/ace598Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red GiantsJames S. Kuszlewicz0https://orcid.org/0000-0002-3322-5279Marc Hon1https://orcid.org/0000-0003-2400-6960Daniel Huber2https://orcid.org/0000-0001-8832-4488Center for Astronomy (Landessternwarte), Heidelberg University , Königstuhl 12, D-69118 Heidelberg, Germany ; james.kuszlewicz@gmail.com; Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark; Max-Planck-Institut für Sonnensystemforschung , Justus-von-Liebig-Weg 3, D-37077 Göttingen, GermanyInstitute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USAInstitute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USAWe present measurements of the dipole mode asymptotic period spacing (ΔΠ _1 ), 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 ΔΠ _1 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.https://doi.org/10.3847/1538-4357/ace598AsteroseismologyStellar propertiesStellar oscillationsAstronomy data analysis |
| spellingShingle | James S. Kuszlewicz Marc Hon Daniel Huber Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants The Astrophysical Journal Asteroseismology Stellar properties Stellar oscillations Astronomy data analysis |
| title | Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants |
| title_full | Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants |
| title_fullStr | Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants |
| title_full_unstemmed | Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants |
| title_short | Mixed-mode Ensemble Asteroseismology of Low-luminosity Kepler Red Giants |
| title_sort | mixed mode ensemble asteroseismology of low luminosity kepler red giants |
| topic | Asteroseismology Stellar properties Stellar oscillations Astronomy data analysis |
| url | https://doi.org/10.3847/1538-4357/ace598 |
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