Descripción del proyecto
Modelo avanzado para descifrar la dinámica y evolución de la rotación estelar
La dinámica de rotación de las estrellas influye de manera considerable en su evolución y en la de su entorno planetario y galáctico. Los últimos avances en heliosismología y astrosismología espacial han revelado que el núcleo del Sol gira de forma casi uniforme, mientras que las estrellas subgigantes y las gigantes rojas experimentan drásticas ralentizaciones. Estos hallazgos ponen de relieve la necesidad de comprender mejor las interacciones estrella y planeta y entre estrella y estrella, que contribuyen a modelar las arquitecturas orbitales y a modificar la evolución estelar. El equipo del proyecto SPIRE, financiado con fondos del Consejo Europeo de Investigación, pretende desarrollar modelos de vanguardia que describan la evolución de las estrellas en rotación y sus sistemas a largo plazo. Al implementar estos modelos en códigos avanzados de evolución estelar, SPIRE mejorará la comprensión de la dinámica del universo por parte de los investigadores.
Objetivo
The rotational dynamics of stars strongly impacts their evolution and those of their planetary and galactic environment. Space helio- and asteroseismology recently allowed an observational revolution in this domain. They revealed, e.g. that the core of the Sun is close to a uniform rotation while those of subgiant and red giant stars slow down drastically during their evolution. These important results demonstrate that powerful dynamical mechanisms (internal waves, magnetic fields, turbulence) are in action to extract angular momentum all along the evolution of stars.
Simultaneously, a very large diversity of stellar systems has been discovered and their number will strongly increase thanks to new space missions (K2, TESS, PLATO). It is thus urgent to progress on our understanding of star-planet and star-star interactions: highly complex dynamical processes leading to tidal dissipation in stars play a key role to shape the orbital architecture of their systems and they may deeply modify their evolution.
To interpret these observational breakthroughs, it is necessary to develop now new frontier theoretical and numerical long-term evolution models of rotating magnetic stars and of their systems. To reach this ambitious objective, the SPIRE project will develop new groundbreaking equations, prescriptions, and scaling laws that describe coherently all dynamical mechanisms that transport angular momentum and drive tidal dissipation in stars using advanced semi-analytical modeling and numerical simulations. They will be implemented in the new generation dynamical stellar evolution code STAREVOL and N-body code ESPER. This will allow us to provide state-of-the-art ab-initio integrated and coupled models for the long-term evolution of stars and of their systems, which cannot be directly simulated in 3D yet. SPIRE will thus provide key inputs for the whole astrophysical community: understanding the dynamics of stars is a fundamental step to understand our Universe.
Ámbito científico
Programa(s)
Régimen de financiación
ERC-COG - Consolidator GrantInstitución de acogida
75015 PARIS 15
Francia