Helioseismic inference of the solar radiative opacity

Abstract

The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current debate on its chemical composition. The problem reaches far beyond chemical abundances and is intimately linked to microscopic and macroscopic physical ingredients of solar models such as radiative opacity, for which experimental results have been recently measured that still await theoretical explanations. We present opacity profiles derived from helioseismic inferences and compare them with detailed theoretical computations of individual element contributions using three different opacity computation codes, in a complementary way to experimental results. We find that our seismic opacity is about 10% higher than theoretical values used in current solar models around 2 million degrees, but lower by 35% than some recent available theoretical values. Using the Sun as a laboratory of fundamental physics, we show that quantitative comparisons between various opacity tables are required to understand the origin of the discrepancies between reported helioseismic, theoretical and experimental opacity values.

arXiv commentPublished in Nature Communications on January 27. The Arxiv version is the version including supplementary figures as part of the Methods Section

References in corpus (60)

• The chemical composition of the Sun
• The 'Forbidden' Abundance of Oxygen in the Sun
• Dynamo action by differential rotation in a stably stratified stellar interior
• Solar fusion cross sections II: the pp chain and CNO cycles
• Line formation in solar granulation: IV. [O I], OI and OH lines and the photospheric O abundance
• The chemical make-up of the Sun: A 2020 vision
• Element Diffusion in the Solar Interior
• Up-dated opacities from the Opacity Project
• Influence of gravity waves on the internal rotation and Li abundance of solar-type stars
• A new Generation of Standard Solar Models
• New Solar Composition: The Problem With Solar Models Revisited
• Solar Interior Rotation and its Variation
• Probing the interior physics of stars through asteroseismology
• CLES, Code Liegeois d'Evolution Stellaire
• Solar Neutrinos: Status and Prospects
• The solar chemical composition
• A New Generation of Los Alamos Opacity Tables
• Deeply penetrating banded zonal flows in the solar convection zone
• Observational constraints on the origin of the elements. IV: The standard composition of the Sun
• Stellar Evolution with Rotation and Magnetic Fields IV: The Solar Rotation Profile
• Sub-Inertial Gravity Modes in the B8V Star KIC 7760680 Reveal Moderate Core Overshooting and Low Vertical Diffusive Mixing
• Fresh insights on the structure of the solar core
• Surprising Sun
• Global Seismology of the Sun
• The Rotation Of The Deep Solar Layers
• A more realistic representation of overshoot at the base of the solar convective envelope as seen by helioseismology
• The discrepancy between solar abundances and helioseismology
• On the opacity change required to compensate for the revised solar composition
• Solar structure and evolution
• Can Enhanced Diffusion Improve Helioseismic Agreement for Solar Models with Revised Abundances?
• Accurate determination of the free-free Gaunt factor; I - non-relativistic Gaunt factors
• Gravity Waves in the Sun
• Impacts of radiative accelerations on solar-like oscillating main-sequence stars
• Seismic tests for solar models with tachocline mixing
• Testing the effects of opacity and the chemical mixture on the excitation of pulsations in B stars of the Magellanic Clouds
• Electric microfield distributions in electron-ion plasmas
• Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
• The Impact of Enhanced Iron Opacity on Massive Star Pulsations: Updated Instability Strips
• Generation of internal gravity waves by penetrative convection
• Improved Helioseismic Analysis of Medium-l Data from the Michelson Doppler Imager
• Element abundance ratios in the quiet Sun transition region
• Accounting for highly excited states in detailed opacity calculations
• Interpretation of the BRITE oscillation data of the hybrid pulsator $\nu$ Eridani: a call for the modification of stellar opacities
• Solar models with convective overshoot, the solar-wind mass loss, and a PMS disk accretion: helioseismic quantities, Li depletion and neutrino fluxes
• Complex asteroseismology of the $\beta$ Cep/SPB pulsator $\nu$ Eridani: constraints on opacities
• Combining multiple structural inversions to constrain the Solar modelling problem
• Non-LTE Model Atmospheres for Late-Type Stars II. Restricted NLTE Calculations for a Solar-Like Atmosphere
• Higher metal abundances do not solve the solar problem
• Microscopic diffusion of partly ionized metals in the Sun and metal-poor stars
• On the hydrostatic stratification of the solar tachocline
• Predictions for gravity-mode periods and surface abundances in intermediate-mass dwarfs from shear mixing and radiative levitation
• Determining the metallicity of the solar envelope using seismic inversion techniques
• The $\beta$ Cep/SPB star 12 Lacertae: extended mode identification and complex seismic modelling
• Evidence of a signature of planet formation processes from solar neutrino fluxes
• Imprint of planet formation in the deep interior of the Sun
• Seismic Solar Models from Ledoux discriminant inversions
• Helioseismic and Neutrino Data Driven Reconstruction of Solar Properties
• Anticipating the Sun's heavy-element abundance
• Stark effect modeling in the detailed opacity code SCO-RCG
• K-shell spectroscopy in hot plasmas: Stark effect, Breit interaction and QED corrections

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• Solar models with protosolar accretion and turbulent mixing
• Asteroseismic modelling of main-sequence solar-like stars and Kepler exoplanet host stars with the FICO procedure I. Catalogue of fundamental stellar properties
• The Opacity Project: R-Matrix Calculations for Opacities of High-Energy-Density Astrophysical and Laboratory Plasmas
• The impact of the transport of chemicals and electronic screening on helioseismic and neutrino observations in solar models
• A $\nu$ look at the Sun: Probing the conditions of the solar core using ${}^8$B neutrinos
• R-matrix calculations for opacities: V. Temperature-density dependence of photoabsorption cross sections and opacity spectra of oxygen ions O VI and O VII