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Contributed talk at the virtual workshop Exoplanets Orbits & Dynamics hosted by University of Liege on Jan. 19-22, 2021. Workshop website: https://sites.google.com/view/exodynamics/home

The architecture of planetary systems is evolving significantly with time, with several mechanisms acting on different timescales: migration within the native disk, expected to occur on few Myrs before disk dissipation; planet-planet dynamical instabilities; gravitational interactions with passing bodies (more frequent for stars born in clusters) and bound companions on wide orbits (through, e.g., the Kozai mechanisms), and circularization of the orbit by tides from the host stars, which could be active on much longer timescales. Understanding the original configurations of the systems and the timescales on which these various mechanisms work is easier when observing planetary systems at young ages, with planets closer to their formation time and possibly also to their birthsites. We will present the emerging results from the study young planetary systems in the framework of the GAPS program ongoing with HARPS-N at TNG and other instruments. We will focus our attention on young multi-planet systems discovered with transits or radial velocity technique and to systems with transiting planets for which additional diagnostics to constrain the system architecture are available (e.g. spin-orbit angle from Rossiter effect). In the study of such young systems, intrinsic stellar variability typically represents the dominant noise source. We will describe the tools for handling magnetic activity simultaneously to radial velocity orbit and/or transit fit which were developed and routinely used in the context of the project.

Silvano Desidera: Young planetary systems with close-in planets