129 citations · 518 across the 27 of their papers we have counts for
27 papers
Probing magnetic fields in stars: A 2D oscillation framework including rotation and magnetism
Antoine Fort, Rhita-Maria Ouazzani, Lucas Barrault +2
Understanding the role of internal magnetic fields in stars remains a major challenge for the description of angular momentum transport and stellar evolution. It is therefore essen…
Magnetic field measurements in a sample of Class I and flat-spectrum protostars observed with SPIRou
L. Drouglazet, E. Alecian, A. Sousa +27
Magnetic fields play a crucial role throughout stellar evolution, regulating angular momentum, channelling accretion, and launching jets and outflows. While the magnetic properties…
Nonlinear interaction between dynamo-generated magnetic fields, mean flows and internal gravity waves in stellar stably-stratified layers: From 3D to 1D
Florentin Daniel, Ludovic Petitdemange, Charly Pinçon +3
Magnetic fields have been constrained at the surface of several massive and intermediate-mass stars, but their origin and properties in deep stellar radiative interiors are still d…
A few ideas to promote inclusion
Thibaut Paumard, Aurélie Guilbert-Lepoutre, Maïca Clavel +5
Promoting diversity, equity, inclusion and accessibility (DEIA) is both a legal and professional responsibility in French research institutions. This paper presents practical strat…
Enabling Blind and Visually Impaired Individuals to Pursue Careers in Science
Ludovic Petitdemange, Salomé Nashed
Blind and Visually Impaired (BVI) Individuals face significant challenges in science due to the discipline's reliance on visual elements such as graphs, diagrams, and laboratory wo…
New constraint on Europa's ice shell: magnetic signature from the ocean
Florentin Daniel, Ludovic Petitdemange, Christophe Gissinger
Jupiter's icy moons are believed to host subsurface liquid oceans, and among them, Europa stands out as one of the most promising candidates for extraterrestrial life. Yet, the pro…
The Future of Solar modelling: requirements for a new generation of solar models
Gael Buldgen, Gloria. Canocchi, Arthur. Le Saux +22
Helioseismology and solar modelling have enjoyed a golden era thanks to decades-long surveys from ground-based networks such as for example GONG, BiSON, IRIS and the SOHO and SDO s…
Magnetic field morphologies in convective zones influenced by a turbulent surface layer
Anna Guseva, Ludovic Petitdemange, Charly Pinçon
Spectropolarimetric observations show that many low-mass stars possess large-scale poloidal magnetic fields with considerable dipole component, which in some cases exhibit temporal…
Run-away transition to turbulent strong-field dynamo
Anna Guseva, Ludovic Petitdemange, Steven M. Tobias
Planets and stars are able to generate coherent large-scale magnetic fields by helical convective motions in their interiors. This process, known as hydromagnetic dynamo, involves…
Coriolis darkening in late-type stars II. Effect of self-sustained magnetic fields in stratified convective envelope
C. Pinçon, L. Petitdemange, R. Raynaud +4
Modeling the surface brightness distribution of stars is of prime importance to interpret observations. Nevertheless, this remains quite challenging for cool stars as it requires o…
Subcritical transition to turbulence triggered by a magnetic dynamo
Florentin Daniel, Ludovic Petitdemange, Christophe Gissinger
It has recently been shown that a significant slowdown of many stars can be attributed to the emergence of a strong magnetic field within the radiative region, where heat is transf…
Tayler-Spruit dynamos in simulated radiative stellar layers
Ludovic Petitdemange, Florence Marcotte, Christophe Gissinger +1
The Tayler-Spruit dynamo mechanism has been proposed two decades ago as a plausible mechanism to transport angular momentum in radiative stellar layers. Direct numerical simulation…
Spin-down by dynamo action in simulated radiative stellar layers
Ludovic Petitdemange, Florence Marcotte, Christophe Gissinger
The evolution of a star is influenced by its internal rotation dynamics through transport and mixing mechanisms, which are poorly understood. Magnetic fields can play a role in tra…
Magnetic effects on fields morphologies and reversals in geodynamo simulations
Mélissa D. Menu, Ludovic Petitdemange, Sébastien Galtier
The dynamo effect is the most popular candidate to explain the non-primordial magnetic fields of astrophysical objects. Although many systematic studies of parameters have already…
Magnetohydrodynamics of stably stratified regions in planets and stars
J. Philidet, C. Gissinger, F. Lignières +1
Stably stratified layers are present in stellar interiors (radiative zones) as well as planetary interiors - recent observations and theoretical studies of the Earth's magnetic fie…
Inverse cascade of hybrid helicity in -MHD turbulence
Mélissa D. Menu, Sébastien Galtier, Ludovic Petitdemange
We investigate the impact of a solid-body rotation on the large-scale dynamics of an incompressible magnetohydrodynamic turbulent flow in presence of a background magnetic fi…
A magnetically driven equatorial jet in Europa's ocean
Christophe Gissinger, Ludovic Petitdemange
During recent decades, data from space missions have provided strong evidence of deep liquid oceans underneath a thin outer icy crust on several moons of Jupiter, particularly Euro…
Systematic parameter study of dynamo bifurcations in geodynamo simulations
Ludovic Petitdemange
We investigate the nature of the dynamo bifurcation in a configuration applicable to the Earth's liquid outer core. Numerical studies on the stability domain of dipolar magnetic fi…
Gravity darkening in late-type stars. The Coriolis effect
Raphaël Raynaud, Michel Rieutord, Ludovic Petitdemange +2
Recent interferometric data have been used to constrain the brightness distribution at the surface of nearby stars, in particular the so-called gravity darkening that makes fast ro…
Three Branches of Dynamo Action
Emmanuel Dormy, Ludivine Oruba, Ludovic Petitdemange
In addition to the weak-dipolar state and to the fluctuating-multipolar state, widely discussed in the literature, a third regime has been identified in Dormy (2016). It correspond…
Dipolar dynamos in stratified systems
R. Raynaud, L. Petitdemange, E. Dormy
Observations of low-mass stars reveal a variety of magnetic field topologies ranging from large-scale, axial dipoles to more complex magnetic fields. At the same time, three-dimens…
Influence of the mass distribution on the magnetic field topology
Raphaël Raynaud, Ludovic Petitdemange, Emmanuel Dormy
Context. Three-dimensional spherical dynamo simulations carried out within the framework of the anelastic approximation have revealed that the established distinction between dipol…
Mechanisms of Planetary and Stellar Dynamos
Emmanuel Dormy, Ludovic Petitdemange, Martin Schrinner
We review some of the recent progress on modeling planetary and stellar dynamos. Particular attention is given to the dynamo mechanisms and the resulting properties of the field. W…
Bistability between equatorial and axial dipoles during magnetic field reversals
Christophe Gissinger, Ludovic Petitdemange, Martin Schrinner +1
Numerical simulations of the geodynamo in presence of an heterogeneous heating are presented. We study the dynamics and the structure of the magnetic field when the equatorial symm…