DUETS II - Red giant asteroseismic binaries. Binary confirmation and prospects for double-seismic model inference
Abstract
Red giants displaying solar-like oscillations allow precise stellar properties to be derived. Asteroseismic binaries (ABs), which are gravitationally bound systems where both stars show detectable oscillations, can provide constraints on the interior of two coeval stars, allowing us to model them jointly and potentially obtain constraints unavailable from either star individually. This makes ABs potential laboratories for calibrating stellar evolution theory. In this context, AB candidates (ABCs) are systems showing two oscillators, which are as of yet not confirmed as gravitationally bound. We aimed to confirm ABCs and other red giant binary candidates, as well as demonstrate the advantages of AB modeling inference. We obtained spectroscopic indicators of binarity for 60 oscillating red giants that have photometric (33 stars) and/or asteroseismic (38) indications of binarity. We confirm 12 of our 60 targets as spectroscopic binaries, 8 of which are ABs as well. Cross-matching with Gaia DR3 and APOGEE DR17, we identify a further 9 likely binaries, at least 6 of which are also ABCs. We then investigated the impact of simultaneously modeling the oscillation modes of both oscillators of an AB. We inferred stellar properties for; one binary of extra-Galactic origin containing one detectable red-giant-branch (RGB) oscillator; one AB with RGB oscillators; and two ABCs with RGB oscillators. We find that the mode frequencies of the two ABCs and the confirmed AB are well-described with a coeval modeling of the stellar components. We demonstrate that the simultaneous modeling of ABs with two RGB stars can be used to infer the stellar helium content down to 3% precision, compared to 5% when using only the brightest star. Finally, the metal-poor binary KIC2971380 hints for a need to correct the νmax scaling relation, supporting recent studies of extremely metal-poor oscillators.
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BibTeX
@misc{thomsen2026duets,
title = {{DUETS II - Red giant asteroseismic binaries. Binary confirmation and prospects for double-seismic model inference}},
author = {J. S. Thomsen and W. E. van Rossem and A. Miglio and A. Mazzi and V. D'Orazi and J. Y. Choi and W. H. Ball and M. Tailo and M. Matteuzzi and E. Corsaro and K. Brogaard and M. Marcussen and M. N. Lund and F. Grundahl and E. Knudstrup and D. Slumstrup},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36209},
eprint = {2610.36209},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36209},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - DUETS II - Red giant asteroseismic binaries. Binary confirmation and prospects for double-seismic model inference
AU - J. S. Thomsen
AU - W. E. van Rossem
AU - A. Miglio
AU - A. Mazzi
AU - V. D'Orazi
AU - J. Y. Choi
AU - W. H. Ball
AU - M. Tailo
AU - M. Matteuzzi
AU - E. Corsaro
AU - K. Brogaard
AU - M. Marcussen
AU - M. N. Lund
AU - F. Grundahl
AU - E. Knudstrup
AU - D. Slumstrup
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36209
UR - https://arxiv.org/abs/2610.36209
AB - Red giants displaying solar-like oscillations allow precise stellar properties to be derived. Asteroseismic binaries (ABs), which are gravitationally bound systems where both stars show detectable oscillations, can provide constraints on the interior of two coeval stars, allowing us to model them jointly and potentially obtain constraints unavailable from either star individually. This makes ABs potential laboratories for calibrating stellar evolution theory. In this context, AB candidates (ABCs) are systems showing two oscillators, which are as of yet not confirmed as gravitationally bound. We aimed to confirm ABCs and other red giant binary candidates, as well as demonstrate the advantages of AB modeling inference. We obtained spectroscopic indicators of binarity for 60 oscillating red giants that have photometric (33 stars) and/or asteroseismic (38) indications of binarity. We confirm 12 of our 60 targets as spectroscopic binaries, 8 of which are ABs as well. Cross-matching with Gaia DR3 and APOGEE DR17, we identify a further 9 likely binaries, at least 6 of which are also ABCs. We then investigated the impact of simultaneously modeling the oscillation modes of both oscillators of an AB. We inferred stellar properties for; one binary of extra-Galactic origin containing one detectable red-giant-branch (RGB) oscillator; one AB with RGB oscillators; and two ABCs with RGB oscillators. We find that the mode frequencies of the two ABCs and the confirmed AB are well-described with a coeval modeling of the stellar components. We demonstrate that the simultaneous modeling of ABs with two RGB stars can be used to infer the stellar helium content down to 3% precision, compared to 5% when using only the brightest star. Finally, the metal-poor binary KIC2971380 hints for a need to correct the ν_max scaling relation, supporting recent studies of extremely metal-poor oscillators.
ER -