Ensemble Individual Mode Frequency Modeling of Kepler Giants - Extending the IACgrid towards the red-giant branch
Abstract
Precise stellar parameters, in particular ages, are vital for understanding the formation and history of the Milky Way. Usually, this is achieved by fitting stellar evolution models to observational constraints such as spectroscopic and astrometric parameters. Adding global asteroseismic properties to the classical parameters (global seismic modeling) breaks some degeneracies and improves the results. However, this approach has its limitations, with red-giant random age uncertainties usually ∼ 20-50%, and often lacking proper quantification of the systematics. We aim to extend seismic modeling to include individual mode frequencies for red-giant branch stars, increasing the number of evolved solar-like oscillators with precise stellar parameters (ages, masses, and radii), and allowing us to quantify the systematics in global seismic modeling. We developed a grid of stellar evolutionary models and computed the individual oscillation frequencies, including a figure of merit to find the best-fitting model. We validate our methodology on a sample of red giants with individual frequency modeling from the literature, finding our masses, radii, and ages in close agreement. We then apply our method to around 100 Kepler red-giant branch stars of near-solar mass and metallicity, which previously have only been modeled with global seismic parameters. We obtain random average uncertainties of 3.4%, 1.3%, and 13.2%, for stellar masses, radii, and ages, respectively. We find that ages from individual mode frequency modeling are significantly, 14% on average, larger than those from global seismic mass-constrained modeling. The modeled luminosities agree within 1.0% with those derived from Gaia parallaxes. We conclude that modeling individual mode frequencies improves age precision by a factor of two for red-giant branch stars, providing stronger constraints for galactic archaeology.
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BibTeX
@misc{grossmann2026ensemble,
title = {{Ensemble Individual Mode Frequency Modeling of Kepler Giants - Extending the IACgrid towards the red-giant branch}},
author = {D. H. Grossmann and S. Mathur and P. G. Beck and D. Godoy-Rivera and B. Liagre and R. A. Garcia and L. S. Schimak and D. B. Palakkatharappil and M. H. Pinsonneault and F. Perez Hernandez},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.09835},
eprint = {2611.09835},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.09835},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Ensemble Individual Mode Frequency Modeling of Kepler Giants - Extending the IACgrid towards the red-giant branch
AU - D. H. Grossmann
AU - S. Mathur
AU - P. G. Beck
AU - D. Godoy-Rivera
AU - B. Liagre
AU - R. A. Garcia
AU - L. S. Schimak
AU - D. B. Palakkatharappil
AU - M. H. Pinsonneault
AU - F. Perez Hernandez
PY - 2026
DA - 2026/11/06
PB - arXiv
DO - 10.48550/arxiv.2611.09835
UR - https://arxiv.org/abs/2611.09835
AB - Precise stellar parameters, in particular ages, are vital for understanding the formation and history of the Milky Way. Usually, this is achieved by fitting stellar evolution models to observational constraints such as spectroscopic and astrometric parameters. Adding global asteroseismic properties to the classical parameters (global seismic modeling) breaks some degeneracies and improves the results. However, this approach has its limitations, with red-giant random age uncertainties usually ∼ 20-50%, and often lacking proper quantification of the systematics. We aim to extend seismic modeling to include individual mode frequencies for red-giant branch stars, increasing the number of evolved solar-like oscillators with precise stellar parameters (ages, masses, and radii), and allowing us to quantify the systematics in global seismic modeling. We developed a grid of stellar evolutionary models and computed the individual oscillation frequencies, including a figure of merit to find the best-fitting model. We validate our methodology on a sample of red giants with individual frequency modeling from the literature, finding our masses, radii, and ages in close agreement. We then apply our method to around 100 Kepler red-giant branch stars of near-solar mass and metallicity, which previously have only been modeled with global seismic parameters. We obtain random average uncertainties of 3.4%, 1.3%, and 13.2%, for stellar masses, radii, and ages, respectively. We find that ages from individual mode frequency modeling are significantly, 14% on average, larger than those from global seismic mass-constrained modeling. The modeled luminosities agree within 1.0% with those derived from Gaia parallaxes. We conclude that modeling individual mode frequencies improves age precision by a factor of two for red-giant branch stars, providing stronger constraints for galactic archaeology.
ER -