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We study the impact of rotation on the hydrodynamic evolution of convective vortices during stellar collapse. Using linear hydrodynamics equations, we study the evolution of the vortices from their initial radii in convective shells down to…

Solar and Stellar Astrophysics · Physics 2021-03-17 E. Abdikamalov , T. Foglizzo , O. Mukazhanov

We have identified an important source of mixing in stellar radiation zones, that would arise whenever two conditions are satisfied: (1) the presence of an inverse vertical compositional gradient, and (2) the presence of…

Solar and Stellar Astrophysics · Physics 2015-06-22 Michael Medrano , Pascale Garaud , Stephan Stellmach

We study the effects of rotation on the torsional modes of oscillating relativistic stars with a solid crust. Earlier works in Newtonian theory provided estimates of the rotational corrections for the torsional modes and suggested that they…

General Relativity and Quantum Cosmology · Physics 2008-11-26 M. Vavoulidis , A. Stavridis , K. D. Kokkotas , H. Beyer

We present measurements of the azimuthal orientation {\theta}(t) and thermal amplitude {\delta}(t) of the large-scale circulation (LSC) of turbulent rotating convection within an unprecedented large Rossby number range 1<Ro<314. Results of…

Fluid Dynamics · Physics 2017-04-26 Jin-Qiang Zhong , Hui-Min Li , Xue-ying Wang

Internal gravity waves (IGWs) are likely to cause mixing in stellar interiors. Studies show that the mixing by these waves changes drastically across age and mass (Varghese et al. 2023, arXiv:2211.06432). Here, we study the effect of…

Solar and Stellar Astrophysics · Physics 2024-07-26 A. Varghese , R. P. Ratnasingam , R. Vanon , P. V. F. Edelmann , S. Mathis , T. M. Rogers

We determine instability domains on the Hertzsprung-Russel diagram for rotating main sequence stars with masses 2-20 $\mathrm M_\odot$. The effects of the Coriolis force are treated in the framework of the traditional approximation.…

Solar and Stellar Astrophysics · Physics 2017-05-31 Wojciech Szewczuk , Jadwiga Daszyńska-Daszkiewicz

Internal gravity waves propagate in stellar radiative zones and transport angular momentum throughout the evolution of stars, shaping the internal rotation pro le of these regions. We use the analytical study of Andre\'e et al. (2018) to…

Solar and Stellar Astrophysics · Physics 2019-01-23 Q. André , S. Mathis , L. Amard

Luminous blue variables are an intermediate stage in the evolution of high-mass stars characterized by extreme mass loss and substantial variability. The stars show large irregular episodic variations on timescales of years to decades in…

Solar and Stellar Astrophysics · Physics 2025-02-14 Emily M. Levesque , Henny J. G. L. M. Lamers , Alex de Koter

Rotational mixing, the key process in stellar evolution, transports angular momentum and chemical elements in stellar radiative zones. In the past two decades, an emphasis has been placed on the turbulent transport induced by the vertical…

Solar and Stellar Astrophysics · Physics 2020-03-25 Junho Park , Vincent Prat , Stéphane Mathis

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 rotating stars brighter at their poles than at their equator.…

Solar and Stellar Astrophysics · Physics 2020-03-17 Raphaël Raynaud , Michel Rieutord , Ludovic Petitdemange , Thomas Gastine , Bertrand Putigny

Observations show that (i) multiple gas phases can coexist in the atmospheres of galaxies and clusters; (ii) these atmospheres may be significantly rotating in the inner parts, with typical velocities that approach or even exceed the local…

Astrophysics of Galaxies · Physics 2019-03-27 Emanuele Sobacchi , Mattia Sormani

We investigate the effect of weak rotation on the large-scale circulation (LSC) of turbulent Rayleigh-B\'{e}nard convection, using the theory for cessations in a low-dimensional stochastic model of the flow previously studied. We determine…

Fluid Dynamics · Physics 2015-06-05 Michael Assaf , Luiza Angheluta , Nigel Goldenfeld

The growth of instabilities is key to trigger a supernova explosion during the phase of stalled shock, immediately after the birth of a proto-neutron star (PNS). We assess the effect of stellar rotation on neutrino-driven convection and…

High Energy Astrophysical Phenomena · Physics 2023-06-22 A. -C. Buellet , T. Foglizzo , J. Guilet , E. Abdikamalov

Small levels of turbulence can be present in stellar radiative interiors due to, e.g., instability of rotational shear. In this paper we estimate turbulent transport coefficients for stably stratified rotating stellar radiation zones.…

Solar and Stellar Astrophysics · Physics 2012-05-23 L. L. Kitchatinov , A. Brandenburg

Using numerical simulations of rapidly rotating Boussinesq convection in a Cartesian box, we study the formation of long-lived, large-scale, depth-invariant coherent structures. These structures, which consist of concentrated cyclones, grow…

Fluid Dynamics · Physics 2014-12-11 Céline Guervilly , David W. Hughes , Chris A. Jones

Using direct numerical simulations of forced rotating turbulence, we study the effect of rotation on the growth rate and the saturation level of the small-scale dynamo. For slow rotation rates, increasing the rotation rate reduces both the…

Fluid Dynamics · Physics 2025-02-26 G. Kishore , Nishant K. Singh

Motivated by understanding the dynamics of stellar and planetary interiors, we have performed a set of direct numerical simulations of Boussinesq convection in a rotating full sphere. The domain is internally heated with fixed temperature…

Fluid Dynamics · Physics 2021-05-05 Yufeng Lin , Andrew Jackson

Much progress has recently been made in understanding and quantifying vertical mixing induced by double-diffusive instabilities such as fingering convection (usually called thermohaline convection) and oscillatory double-diffusive…

Earth and Planetary Astrophysics · Physics 2014-01-07 Pascale Garaud

Gravity waves (or their signatures) are detected in stars thanks to helio- and asteroseismology and they may play an important role in the evolution of stellar angular momentum. Moreover, the observational study of the CoRoT target HD51452…

Solar and Stellar Astrophysics · Physics 2014-05-08 Stéphane Mathis , Coralie Neiner , Nguyet Tran Minh

The first part of this paper aims at illustrating the intense scientific activity in the field of stellar rotation although, for sake of shortness, we cannot be exhaustive nor give any details. The second part is devoted to the rotation as…

Astrophysics · Physics 2007-05-23 M. J. Goupil , R. Samadi , J. Lochard , W. A. Dziembowski , A. Pamyatnykh