Speaker
Description
Radial velocity (RV) surveys have revealed a rich population of cold Jupiters and Solar System analogues, but the long-standing degeneracy between planet mass and orbital inclination continues to limit what we can infer about their true architectures. The upcoming Gaia Data Release 4 (DR4), expected within the next year, will change that by providing epoch astrometry for more than a billion stars - enabling direct measurements of orbital inclination and true planetary masses for thousands of known systems. In this talk, I show how much we can already achieve by combining Gaia DR3 astrometry with existing RV time series, and by leveraging proper motion anomalies from the Hipparcos–Gaia baseline. These early results demonstrate that astrometric signatures are already detectable for several known RV planets. I’ll also preview how DR4 will extend this capability to a much broader population, providing the first truly three-dimensional view of planetary orbits and a pathway to understanding long-period planet formation.
