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Abstract: In its all-sky survey, the ESA global astrometry mission Gaia will performhigh-precision astrometry and photometry for 1 billion stars down to $V = 20$mag. The data collected in the Gaia catalogue, to be published by the end ofthe next decade, will likely revolutionize our understanding of many aspects ofstellar and Galactic astrophysics. One of the relevant areas in which the Gaiaobservations will have great impact is the astrophysics of planetary systems.This summary focuses on a the complex technical problems related to andchallenges inherent in correctly modelling the signals of planetary systemspresent in measurements collected with a space-borne observatory poised tocarry out precision astrometry at the micro-arcsecond $\mu$as level, and bon the potential of Gaia $\mu$as astrometry for important contributions to theastrophysics of planetary systems.

Autor: A. Sozzetti INAF - Osservatorio Astronomico di Torino


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