Denys Wilkinson Building, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH
Anne-Marie Lagrange, LESIA Meudon
Cold Giants in the Gaia Era
Giant planets likely govern the assembly and long-term stability of planetary systems, including inner rocky worlds. Yet our knowledge is scarcest precisely where Solar System analogs reside, at ~5–30 au, because individual detection techniques (transits, RVs, high-contrast imaging, microlensing) each probe only a biased portion of the mass–semi major-axis plane.
In this talk, I will present the results of surveys combining Gaia DR3 astrometry (and, when available, Gaia–Hipparcos proper-motion anomalies) with RV and high-contrast imaging. They reveal and characterize new outer companions around young stars, debris-disk systems, and around nearby M dwarfs. These newly identified planets will be prime targets for JWST and ELT imaging and atmospheric follow-up. I’ll finally discuss the potential of Gaia DR4 for exoplanets exploration.