Asteroseismic modelling strategies in the PLATO era I. Mean density inversions and direct treatment of the seismic information

Abstract

Asteroseismic modelling will be part of the pipeline of the PLATO mission and will play a key role in the mission precision requirements on stellar mass, radius and age. It is therefore crucial to compare how current modelling strategies perform, and discuss the limitations and remaining challenges for PLATO, such as the so-called surface effects, the choice of physical ingredients, and stellar activity. In this context, we carried out a systematic study of the impact of surface effects on the estimation of stellar parameters. In this work, we demonstrated how combining a mean density inversion with a fit of frequencies separation ratios can efficiently damp the surface effects and achieve precise and accurate stellar parameters for ten Kepler LEGACY targets, well within the PLATO mission requirements. We applied and compared two modelling approaches, directly fitting the individual frequencies, or coupling a mean density inversion with a fit of the ratios, to six synthetic targets with a patched 3D atmosphere from Sonoi et al. (2015) and ten actual targets from the LEGACY sample. The fit of the individual frequencies is unsurprisingly very sensitive to surface effects and the stellar parameters tend to be biased, which constitutes a fundamental limit to both accuracy and precision. In contrast, coupling a mean density inversion and a fit of the ratios efficiently damps the surface effects, and allows us to get both precise and accurate stellar parameters. The average statistical precision of our selection of LEGACY targets with this second strategy is 1.9% for the mass, 0.7% for the radius, and 4.1% for the age, well within the PLATO requirements. Using the mean density in the constraints significantly improves the precision of the mass, radius and age determinations, on average by 20%, 33%, and 16%, respectively.

Accepted for publication in Astronomy & Astrophysics

References in corpus (35)

• The Transiting Exoplanet Survey Satellite
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Helioseismology and Solar Abundances
• Correcting stellar oscillation frequencies for near-surface effects
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• 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
• Asteroseismology of the solar analogs 16 Cyg A & B from Kepler observations
• Asteroseismology for "à la carte" stellar age-dating and weighing: Age and mass of the CoRoT exoplanet host HD 52265
• Fresh insights on the structure of the solar core
• Surface rotation and photometric activity for Kepler targets. II. G and F main-sequence stars, and cool subgiant stars
• The Liege Oscillation Code
• Solar structure and evolution
• A Stellar Model-fitting Pipeline for Asteroseismic Data from the Kepler Mission
• AIMS - A new tool for stellar parameter determinations using asteroseismic constraints
• Fundamental Parameters of Main-Sequence Stars in an Instant with Machine Learning
• Synthetic Stellar Photometry - II. Testing the bolometric flux scale, and tables of bolometric corrections for the Hipparcos/Tycho, Pan-STARRS1, SkyMapper and JWST systems
• The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
• Stellar acoustic radii, mean densities and ages from seismic inversion techniques
• In-depth study of 16CygB using inversion techniques
• Investigating surface correction relations for RGB stars
• Thorough characterisation of the 16 Cygni system Part I: Forward seismic modelling with WhoSGlAd
• On the impact of the structural surface effect on global stellar properties and asteroseismic analyses
• Anomalies in the Kepler Asteroseismic Legacy Project Data. A re-analysis of 16 Cyg A&B, KIC8379927 and 6 solar-like stars
• Solar cycle variation of ${\nu }_{\max }$ in helioseismic data and its implications for asteroseismology
• Surface layer independent model fitting by phase matching: theory and application to HD49933 an HD177153 (aka Perky)
• Comprehensive stellar seismic analysis : New method exploiting the glitches information in solar-like pulsators
• Testing angular momentum transport processes with asteroseismology of solar-type main-sequence stars
• Kepler-93: a testbed for detailed seismic modelling and orbital evolution of super-earths around solar-like stars
• Mending the structural surface effect of 1D stellar structure models with non-solar metallicities based on interpolated 3D envelopes
• Thorough characterisation of the 16 Cygni system. Part II. Seismic inversions of the internal structure
• Impact of magnetic activity on inferred stellar properties of main sequence Sun-like stars

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• The stellar activity-rotation-age relationship under the lens of asteroseismology
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