The HADES Program with HARPS-N@TNG - HADES: THE HArps-n red Dwarf Exoplanet Survey

We present the complete analysis of the Harps-n Dwarf Exoplanet Survey (HADES), which monitored the radial velocity variations of a large sample of M dwarfs, with HARPS-N@TNG, over the last 10 years, to determine the rate of occurrence of small planets around low-mass stars. M dwarfs are attractive targets for planet searches because they represent the shortest route to detecting potentially habitable planets. We paid particular attention to radial velocity jitter levels induced by stellar activity, to rule out radial velocity variations due to astrophysical noise as Keplerian signals. In particular, the analysis of spectral indices based on Ca II H & K and Hα lines enables us to highlight periods due to chromospheric inhomogeneities modulated by stellar rotation and differential rotation. The HADES (HARPS-N Red Dwarf Exoplanet Survey Radial Velocity) project is the result of a collaborative effort between the GAPS Consortium, the Institut de Ciències de l’Espai de Catalunya (ICE), and the Instituto de Astrofísica de Canarias (IAC).