R. Scuflaire

Investigating the impact of Solar Fusion III reaction rates on helioseismic constraints and solar neutrino fluxes

T. Sandron, G. Buldgen, A. Noels, M. A. Dupret et autres

Context. Nuclear reaction rates are crucial ingredients of solar and stellar models, and they directly impact the duration of the life of stars and the energy they produce. In the solar case, the tight observational constraints put on models (mass, radius, luminosity …

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Entropy proxy inversions as tracers of the evolution of physical conditions at the base of the solar convective envelope

G. Buldgen, Alfred F. Noels, V. A. Baturin, J. Christensen‐Dalsgaard et autres

Context. The Sun is an important calibrator in the theory of stellar structure and evolution. However, the accuracy of our solar evolution models is tightly linked to the physical elements that enter their computations. This includes, among others, the equation of state, …

Entropy proxy inversions as tracers of the evolution of physical conditions at the base of the solar convective envelope

G. Buldgen, Alfred F. Noels, V. A. Baturin, J. Christensen‐Dalsgaard et autres

The Sun is an important calibrator for the theory of stellar structure and evolution. However, the accuracy of our solar evolution models is tightly linked to the physical ingredients that enter their computations. This include, amongst other, the equation of state, the …

Constraints on the properties of macroscopic transport in the Sun from combined lithium and beryllium depletion

G. Buldgen, A. Noels, A. M. Amarsi, Devesh Nandal et autres

Context. The Sun is a privileged laboratory of stellar evolution, thanks to the quality and complementary nature of available constraints. Using these observations, we are able to draw a detailed picture of its internal structure and dynamics, which forms the basis of …

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Heavy Elements Abundances Inferred from the First Adiabatic Exponent in the Solar Envelope

В. А. Батурин, Anna V. Oreshina, G. Buldgen, S. V. Ayukov et autres

The first adiabatic exponent profile, noted $Γ_1$, computed along adiabatic coordinates $(T, ρ)$ is in the focus of our study. Under conditions of almost fully ionized hydrogen and helium, the $Γ_1$ profile is quite sensitive to heavy elements ionization. $Γ_1$ decreases in …

Helioseismic determination of the solar metal mass fraction

G. Buldgen, A. Noels, V. A. Baturin, A. V. Oreshina et autres

Context. The metal mass fraction of the Sun Z is a key constraint in solar modelling, but its value is still under debate. The standard solar chemical composition of the late 2000s has the ratio of metals to hydrogen as Z/X = …

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Higher metal abundances do not solve the solar problem

G. Buldgen, P. Eggenberger, Alfred F. Noels, R. Scuflaire et autres

Context. The Sun acts as a cornerstone of stellar physics. Thanks to spectroscopic, helioseismic and neutrino flux observations, we can use the Sun as a laboratory of fundamental physics in extreme conditions. The conclusions we draw are then used to inform and …

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Higher metal abundances do not solve the solar problem

G. Buldgen, P. Eggenberger, A. Noels, R. Scuflaire et autres

Context. The Sun acts as a cornerstone of stellar physics. Thanks to spectroscopic, helioseismic and neutrino flux observations, we can use the Sun as a laboratory of fundamental physics in extreme conditions. The conclusions we draw are then used to inform and …

Standard solar models: Perspectives from updated solar neutrino fluxes and gravity-mode period spacing

S. J. A. J. Salmon, G. Buldgen, Alfred F. Noels, P. Eggenberger et autres

Context.Thanks to the vast and exquisite set of observations that have been made available for the Sun, our star is by far an ideal target for testing stellar models with a unique precision. A recent issue under consideration in the field is …

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Inversions of the Ledoux discriminant: a closer look at the tachocline

G. Buldgen, Sébastien Salmon, M. Godart, Alfred F. Noels et autres

Abstract Modelling the base of the solar convective envelope is a tedious problem. Since the first rotation inversions, solar modellers are confronted with the fact that a region of very limited extent has an enormous physical impact on the Sun. Indeed, it …

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TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR

V. Van Grootel, M. Gillon, Diana Valencia, Nikku Madhusudhan et autres

Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present here the confirmation, based on Spitzer transit observations, that the super-Earth HD 97658 …

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On the evidence of extra mixing in models of 8 M⊙computed with the new solar abundances

M. Godart, Alfred F. Noels, R. Scuflaire

Stars more massive than about 3M⊙ are known to experience loops in the HR diagram during their core helium burning phase. Except for very massive stars the extent of their loops increases with the stellar mass. We show that a stellar evolution …

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