Article (Scientific journals)
Probing stellar cores from inversions of frequency separation ratios
Bétrisey, J.; Buldgen, Gaël
2022In Astronomy and Astrophysics, 663, p. 92
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Keywords :
Asteroseismology; Stars: fundamental parameters; Stars: interiors; Frequency separation; Inversion techniques; Property; Separation ratio; Stars: Interiors; Stars:fundamental parameters; Stellar core; Stellars; Surface effect; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.SR
Abstract :
[en] Context. With the rapid development of asteroseismology thanks to space-based photometry missions such as CoRoT, Kepler, TESS, and in the future, PLATO, and the use of inversion techniques, quasi-model-independent constraints on the stellar properties can be extracted from a given stellar oscillation spectrum. In this context, inversions based on frequency separation ratios, which are less sensitive to surface effects, appear as a promising technique to constrain the properties of stellar convective cores. Aims. We developed an inversion based on frequency separation ratios, with the goal of damping the surface effects of the oscillation frequencies. Using this new inversion, we defined a new indicator to constrain the boundary mixing properties of convective cores in solar-like oscillators. Methods. We verified our inversion technique by conducting tests in a controlled environment, where the stellar mass and radius were known exactly, and conducted an extensive hare and hounds exercise. Results. The inversion is not affected by surface effects. With the construction of an extensive set of models, favoured and forbidden regions can be highlighted in the parameter space. If the ratios are well fitted, unsurprisingly the inversion does not provide any additional information. Conclusions. The indicator, coupled with the inversion based on frequency separation ratios, seems promising at probing the properties of convective cores, especially for F-type stars exhibiting solar-like oscillations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bétrisey, J. ;  Observatoire de Genève, Université de Genève, Versoix, Switzerland
Buldgen, Gaël ;  Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie ; Observatoire de Genève, Université de Genève, Versoix, Switzerland
Language :
English
Title :
Probing stellar cores from inversions of frequency separation ratios
Publication date :
July 2022
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
663
Pages :
A92
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung [CH]
Funding text :
Acknowledgements. J.B and G.B. acknowledge funding from the SNF AMBIZIONE grant No 185805 (Seismic inversions and modelling of transport processes in stars).
Commentary :
Accepted for publication in Astronomy and Astrophysics
Available on ORBi :
since 28 December 2023

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