Abstract

Protoplanetary discs are the place in which planets form and evolve, and the reservoir from which protostar accrete material. The presence of a perturber whether a planet or a stellar companion and its interaction with the parental disc play a crucial role in shaping the dynamics and evolution of the system, generating substructures such as gaps, rings and asymmetries routinely observed with different tracers in discs (large mm dust and gas with ALMA , small micrometric dust with VLT ).

However, characterizing these systems remains challenging: the only two planetary companions unambiguously detected, PDS70b and c, lie in a wide and open cavity of the same object, and once the perturber is a star, massive and wide enough to be detected, characterize the binary orbit is challenging due to the timescales at play.

In this talk, I will show new results to address and mitigate these issues. Firstly, I will show new results from the astrometry and the hydrodynamical models of GG Tau A, a multiple stellar system where the orbits of the stars is still not fully constrained. Then, I will discuss how the advent of the Extremely Large Telescope (ELT), with its first light imager MICADO /MORFEO, will revolutionize the field, providing high angular resolution images that will allow us to detect embedded protoplanets and small-scales substructures.