The UVMag consortium will propose Arago as the M4 mission to ESA.
The Letter of Intent describing Arago and submitted to ESA is available here.
Executive summary : During the formation and the entire life of stars and planets, several physical processes, in particular magnetic fields and winds, influence their dynamics, and thus impact their evolution. These processes directly impact the internal structure of stars, the transport of angular momentum, and of course the direct circumstellar environment. They thus drive not only stellar evolution, but also the formation and fate of planets surrounding the stars and the emergence of life. We propose to follow the life cycle of matter, from the interstellar medium to the surface of stars and the edge of the stellar systems, and thus to study the formation, structure, evolution, and 3D dynamic environment of all types of stars and their planets. This will be done through the use of a high-resolution spectropolarimeter working in both the UV and visible wavelength domains attached to a 1.3 meter telescope.