14-17 mai 2019


Interaction ├ętoile-disque


Florian Gallet (IPAG) florian.gallet1@univ-grenoble-alpes.fr, Louis Amard (Exeter)


The program is now accessible at the bottom of the French version of this page. See you soon in Nice :)


Although the primitive phases of the life of a young star are the seat of many important physical phenomena that will strongly impact its evolution, they are still very poorly known. These young stars, named "classical" TTauri, are magnetically active pre-main-sequence stars around which orbit a disk constituted of gas and dust. Their magnetic field, up to several kG, has a strong impact on the dynamics and structure of the near stellar environment. It is notably during the main pre-sequence that will take place

The circumstellar disk will in turn take the name of accretion disk, when a part of it will be accreted by the central star, or protoplanetary disk, if it will give birth to the formation of planets. In reality, a circumstellar disk is often at the same time an accretion disk and a protoplanetary disk.
In these conditions, the disc will interact with the star but also with the potential cortege of planets around it. One of the possible imprints of this interaction is the apparent constant rotation rate of stars during the first few Myr of their evolution. Despite traces of magnetospheric accretion and stellar contraction, the stars do not seem to accelerate.
It is commonly assumed that this constant rate of rotation is the result of magnetospheric interactions between the star and its surrounding disk. In this context, the main scenario for interpreting the rotational evolution of these young stars is the magnetospheric interaction star-drive.

The aim of this workshop is to provide the French and international community with an overview of the mechanisms of star-disk magnetic interactions and their impact on the evolution of the central star but also, by extension, on the possible cortege of planets orbiting the star.
It aims to bring together both observers and modellers in stellar evolution, expert in protoplanetary accretion disk, and specialists in stellar wind. All these skills being widely developed within the French astrophysical community. At the dawn of the next space missions, notably with the future commissioning of the PLATO satellite, and the exploitation of new generation of ground-based instruments: the first SPIRou lights (CFHT), the future SPIP instrument and Neo-Narval ( TBL), and large interferometers like ALMA, this workshop will come at a crucial point to allow the initiation of future numerical models of the complex interaction between a star, its disk, and its potential planets.

The program will be display in the french version of this page.

e-posters in this session

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