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

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 is the transition region from differential to solid body rotation, the tachocline, which furthermore is influenced by turbulence and is also supposed to be the seat of the solar magnetic dynamo. Moreover, solar models show significant disagreement with the sound speed profile in this region. In this paper, we show how helioseismology can provide further constraints on this region by carrying out an inversion of the Ledoux discriminant. We compare these inversions for Standard Solar Models built using various opacity tables and chemical abundances and discuss the origins of the discrepancies between Solar Models and the Sun.

Accepted for publication as a letter in MNRAS

References in corpus (5)

• CLES, Code Liegeois d'Evolution Stellaire
• Fresh insights on the structure of the solar core
• The Liege Oscillation Code
• Dynamics of the solar tachocline II: the stratified case
• 12 Bootis: a test bed for extra-mixing processes in stars

Cited by in corpus (7)

• Solar structure and evolution
• Kepler-93: a testbed for detailed seismic modelling and orbital evolution of super-earths around solar-like stars
• Seismic Solar Models from Ledoux discriminant inversions
• The impact of the transport of chemicals and electronic screening on helioseismic and neutrino observations in solar models
• Progress in global helioseismology: a new light on the solar modelling problem and its implications for solar-like stars
• Investigating the impact of Solar Fusion III reaction rates on helioseismic constraints and solar neutrino fluxes
• Global Helioseismology