Comprehensive stellar seismic analysis : New method exploiting the glitches information in solar-like pulsators

Abstract

Aims: We develop a method that provides a comprehensive analysis of the oscillation spectra of solar-like pulsators. We define new seismic indicators that should be as uncorrelated and as precise as possible and should hold detailed information about stellar interiors. This is essential to improve the quality of the results obtained from asteroseismology as it will provide better stellar models which in turn can be used to refine inferences made in exoplanetology and galactic archaeology. Methods: The presented method - WhoSGlAd - relies on Gram-Schmidt's orthogonalisation process. A Euclidean vector subspace of functions is defined and the oscillation frequencies are projected over an orthonormal basis in a specific order. This allows the obtention of independent coefficients that we combine to define independent seismic indicators. Results: The developed method has been shown to be stable and to converge efficiently for solar-like pulsators. Thus, detailed and precise inferences can be obtained on the mass, the age, the chemical composition and the undershooting in the interior of the studied stars. However, attention has to be paid when studying the helium glitch as there seems to be a degeneracy between the influence of the helium abundance and that of the heavy elements on the glitch amplitude. As an example, we analyse the 16CygA (HD 186408) oscillation spectrum to provide an illustration of the capabilities of the method.

Accepted for publication in Astronomy and Astrophysics, 20 pages

References in corpus (24)

• 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
• Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
• Correcting stellar oscillation frequencies for near-surface effects
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• CLES, Code Liegeois d'Evolution Stellaire
• A new correction of stellar oscillation frequencies for near-surface effects
• Constraining fundamental stellar parameters using seismology. Application to Alpha Centauri AB
• An asteroseismic signature of helium ionization
• The Liege Oscillation Code
• Measuring the extent of convective cores in low-mass stars using Kepler data: towards a calibration of core overshooting
• Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
• Measurement of acoustic glitches in solar-type stars from oscillation frequencies observed by Kepler
• Surface-effect corrections for solar-like oscillations using 3D hydrodynamical simulations
• Constraining mixing processes in stellar cores using asteroseismology. Impact of semiconvection in low-mass stars
• Asteroseismic estimate of helium abundance of a solar analog binary system
• Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
• Core properties of alpha Cen A using asteroseismology
• Survival of a convective core in low-mass solar-like pulsator HD 203608
• In-depth study of 16CygB using inversion techniques
• Constraints on the structure of 16 Cyg A and 16 Cyg B using inversion techniques
• Influence of metallicity on the near-surface effect on oscillation frequencies

Cited by in corpus (14)

• Thorough characterisation of the 16 Cygni system Part I: Forward seismic modelling with WhoSGlAd
• Buoyancy glitches in pulsating stars revisited
• Asteroseismic modelling strategies in the PLATO era I. Mean density inversions and direct treatment of the seismic information
• Coralie radial-velocity search for companions around evolved stars (CASCADES) III. A new Jupiter host-star: in-depth analysis of HD 29399 using TESS data
• Properties of the ionisation glitch: I. Modelling the ionisation region
• Multi-cavity gravito-acoustic modes in stars: A general analytical resonance condition
• Asteroseismology of evolved stars with EGGMiMoSA I. Theoretical mixed-mode patterns from the subgiant to the RGB phase
• Glitches in solar-like oscillating F-type stars: Theoretical signature of the base of the convective envelope on the ratios $r_{010}$
• Relevance of the small frequency separation for asteroseismic stellar age, mass, and radius. A statistical investigation for main-sequence low-mass stars
• Study with WhoSGlAd of the acoustic depth of the helium glitch across the seismic HR diagram and its impact on the inferred helium abundance
• Physical interpretation of the oscillation spectrum on the RGB and AGB
• Probing stellar cores from inversions of frequency separation ratios
• Advanced asteroseismic modelling: breaking the degeneracy between stellar mass and initial helium abundance
• On the stellar core physics of the 16 Cyg binary system: constraining the central hydrogen abundance using asteroseismology