Jets & Winds

Ejection of matter during protostellar evolution is a key ingredient to remove angular momentum from the star-disk system, allowing material to accrete on the star, and to shape the disk surface density, defining the environment for planet formation. Mass outflows can be broadly divided into two categories: the collimated and high velocity jets, which are very powerful at the early phases, and the slow and compact disk-winds ejected from a wide range of disc-radii and responsible for the late disk dispersal. The JEDI collaboration has a leading international role in the study of mass ejection from young stellar objects, acquired through multi-wavelengths observing programs that have addressed crucial questions related to the jets formation and role in the angular momentum extraction, and to jets evolution. Research in this area include high angular resolution spectral-images with AO-assisted optical/IR (e.g. SPHERE, HST), JWST and ALMA observations to study the jet acceleration and collimation region as a function of the evolution. We also address the properties and role of winds in the disk dispersal through spectroscopic surveys of optical/IR winds forbidden line tracers.