Probing stellar cores from inversions of frequency separation ratios
arXiv:2205.09625 · doi:10.1051/0004-6361/202243640
Abstract
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, that are less sensitive to surface effects, appear as a promising technique to constrain the properties of stellar convective cores. 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. We verified our inversion technique by conducting tests in a controlled environment, where the stellar mass and radius are known exactly, and conducted an extensive hare and hounds exercise. 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, the inversion is unsurprisingly not providing additional information. 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.
Accepted for publication in Astronomy and Astrophysics
References in corpus (31)
- The chemical composition of the Sun
- Low Temperature Opacities
- The PLATO 2.0 Mission
- Solar fusion cross sections II: the pp chain and CNO cycles
- Element Diffusion in the Solar Interior
- Stellar Turbulent Convection: A Selfconsistent Model
- CLES, Code Liegeois d'Evolution Stellaire
- A New Generation of Los Alamos Opacity Tables
- The Liege Oscillation Code
- Measuring the extent of convective cores in low-mass stars using Kepler data: towards a calibration of core overshooting
- Solar structure and evolution
- AIMS - A new tool for stellar parameter determinations using asteroseismic constraints
- Surface-effect corrections for solar-like oscillations using 3D hydrodynamical simulations
- Impacts of radiative accelerations on solar-like oscillating main-sequence stars
- Estimating stellar mean density through seismic inversions
- Model-independent measurement of internal stellar structure in 16 Cygni A and B
- Mean density inversions for red giants and red clump stars
- Using seismic inversions to obtain an internal mixing processes indicator for main-sequence solar-like stars
- Stellar acoustic radii, mean densities and ages from seismic inversion techniques
- In-depth study of 16CygB using inversion techniques
- Constraints on the structure of 16 Cyg A and 16 Cyg B using inversion techniques
- Microscopic diffusion of partly ionized metals in the Sun and metal-poor stars
- Seismic inversion of the solar entropy: A case for improving the Standard Solar Model
- Comprehensive stellar seismic analysis : New method exploiting the glitches information in solar-like pulsators
- Testing stellar evolution with asteroseismic inversions of a main sequence star harboring a small convective core
- Constraining convective regions with asteroseismic linear structural inversions
- Kepler-93: a testbed for detailed seismic modelling and orbital evolution of super-earths around solar-like stars
- Thorough characterisation of the 16 Cygni system. Part II. Seismic inversions of the internal structure
- Asteroseismic Inference of the Central Structure in a Subgiant Star
- Asteroseismic inversions in the Kepler era: application to the Kepler Legacy sample
- Analysis of the linear approximation of seismic inversions for various structural pairs