Progress report on solar age calibration
G. Houdek, D.O. Gough

TL;DR
This paper presents a seismic calibration method for estimating the Sun's age and chemical composition, using low-degree modes and separating contributions from background and glitch effects, resulting in a main-sequence age estimate of 4.68 billion years.
Contribution
It introduces a robust seismic calibration technique that isolates contributions from different stellar structures, improving age and composition estimates over previous methods.
Findings
Estimated solar main-sequence age: 4.68 Gyr
Derived initial heavy-element abundance: Z=0.0169
Method shows consistency with BiSON data
Abstract
We report on an ongoing investigation into a seismic calibration of solar models designed for estimating the main-sequence age and a measure of the chemical abundances of the Sun. Only modes of low degree are employed, so that with appropriate modification the procedure could be applied to other stars. We have found that, as has been anticipated, a separation of the contributions to the seismic frequencies arising from the relatively smooth, glitch-free, background structure of the star and from glitches produced by helium ionization and the abrupt gradient change at the base of the convection zone renders the procedure more robust than earlier calibrations that fitted only raw frequencies to glitch-free asymptotics. As in the past, we use asymptotic analysis to design seismic signatures that are, to the best of our ability, contaminated as little as possible by those uncertain…
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