M-type stars, the most common in the universe, are ideal targets for detecting low-mass planets in the habitable zone. However, little is known about long-period giant planets (GPs) in these systems, as their detection is challenging with transits and radial velocities (RV) due to M stars' faintness and high activity. This limitation can be addressed by combining RV, high-contrast imaging (HCI), and absolute astrometry from Gaia-Hipparcos.

Using the GaiaPMEX tool (Kiefer et al. 2024) with Gaia DR3 data, I searched for GPs around all M stars within 15 pc. GaiaPMEX builds a two-dimensional confidence map of companion mass and semi-major axis, which, when combined with RV and HCI limits, allows us to rule out binaries and identify planetary companions. I constructed a catalog of nearby M dwarfs and conducted a systematic GP search, yielding hundreds of candidates. I will present the results of this survey which allows the study of a new population of long period GPs and in particular, to derive the radial distribution of GPs around M dwarfs beyond 1au.