The solar sulphur abundance in view of large-scale atomic structure calculations and 3D non-LTE models

Abstract

The solar chemical composition is a fundamental yardstick in astrophysics and the topic of heated debate in recent literature. We re-evaluate the abundance of sulphur in the photosphere by studying seven S I lines in the solar disc-centre intensity spectrum. Our analysis considers independent sets of experimental and theoretical oscillator strengths together with, for the first time, three-dimensional non-local thermodynamic equilibrium (3D non-LTE) S I spectrum synthesis. Our best estimate is $A(\mathrm{S})=7.06\pm 0.04$, which is $0.06$ dex to $0.10$ dex lower than that in commonly-used compilations of the solar chemical composition. Our lower solar sulphur abundance deviates from that in CI chondrites, and thereby supports the case for a systematic difference between the composition of the solar photosphere and of CI chondrites that is correlated with $50\%$ condensation temperature. We suggest that precise laboratory measurements of S I oscillator strengths and abundance analyses using 3D magnetohydrodynamic models of the solar photosphere be conducted to further substantiate our conclusions.

arXiv comment13 pages, 5 figures; accepted for publication in Astronomy & Astrophysics

References in corpus (47)

• The chemical composition of the Sun
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere
• The chemical make-up of the Sun: A 2020 vision
• Spectroscopy Made Easy: Evolution
• The Effect of Jupiter's Formation on the Distribution of Refractory Elements and Inclusions in Meteorites
• The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - I. Methods and General Properties
• The elemental composition of the Sun I. The intermediate mass elements Na to Ca
• Observational constraints on the origin of the elements. IV: The standard composition of the Sun
• Sulphur and zinc abundances in Galactic halo stars revisited
• Non-LTE Line-Formation and Abundances of Sulfur and Zinc in F, G, and K Stars
• Abundant refractory sulfur in protoplanetary disks
• Solar structure and evolution
• On inelastic hydrogen atom collisions in stellar atmospheres
• The IAG solar flux atlas: Accurate wavelengths and absolute convective blueshift in standard solar spectra
• The GALAH Survey: Non-LTE departure coefficients for large spectroscopic surveys
• Element Abundances: A New Diagnostic for the Solar Wind
• The forbidden 1082 nm line of sulphur: the photospheric abundance of sulphur in the Sun and 3D effects
• The solar silicon abundance based on 3D non-LTE calculations
• Effective temperature determinations of late-type stars based on 3D non-LTE Balmer line formation
• Inelastic O+H collisions and the OI 777nm solar centre-to-limb variation
• 3D LTE spectral line formation with scattering in red giant stars
• Parent Stars of Extrasolar Planets. XI. Trends with Condensation Temperature Revisited
• 3D non-LTE line formation of neutral carbon in the Sun
• 3D non-LTE iron abundances in FG-type dwarfs
• PySME -- Spectroscopy Made Easier
• The benchmark halo giant HD 122563: CNO abundances revisited with three-dimensional hydrodynamic model stellar atmospheres
• Sulphur abundances from the SI near-infrared triplet at 1045 nm
• FTS atlas of the Sun's spectrally resolved center-to-limb variation
• The AMBRE Project: Origin and evolution of sulfur in the Milky Way
• Extended theoretical transition data in C I - IV
• Sulphur abundances in halo giants from the [S I] line at 1082 nm and the S I triplet around 1045 nm
• 3D Stagger model atmospheres with FreeEOS I. Exploring the impact of microphysics on the Sun
• Sulphur abundances in disk stars as determined from the forbidden 10821 A [SI] line
• On line contribution functions and examining spectral line formation in 3D model stellar atmospheres
• An extended and refined grid of 3D STAGGER model atmospheres. Processed snapshots for stellar spectroscopy
• Chemical abundances in Seyfert galaxies X. Sulphur abundance estimates
• Extended atomic data for oxygen abundance analyses
• Center--limb variation of solar photospheric microturbulence
• Revisiting inelastic Cu+H collisions and the non-LTE Galactic evolution of copper
• Extended MCDHF calculations of energy levels and transition data for N I
• Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5 and Trumpler 20
• The solar photospheric silicon abundance according to CO5BOLD: Investigating line broadening, magnetic fields, and model effects
• The peculiar composition of the Sun is not related to giant planets
• On the Contribution of Very Massive Stars to the Sulfur Abundance in Star-Forming Galaxies: the Role of PISN
• Influence of departures from LTE on determinations of the sulfur abundances in A-K type stars
• A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy