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Both young stars and multi-planet systems are primary objects that allow usto study, understand and constrain planetary formation and evolution theories.We validate the physical nature of two Neptune-type planets transiting TOI-942(TYC 5909-319-1), a previously unacknowledged young star (50+30-20 Myr)observed by the TESS space mission in Sector 5. Thanks to a comprehensivestellar characterization, TESS light curve modelling and preciseradial-velocity measurements, we validated the planetary nature of the TESScandidate and detect an additional transiting planet in the system on a largerorbit. From photometric and spectroscopic observations we performed anexhaustive stellar characterization and derived the main stellar parameters.TOI-942 is a relatively active K2.5V star (logR'hk = -4.17+-0.01) with rotationperiod Prot = 3.39+-0.01 days, a projected rotation velocity vsini=13.8+-0.5km/s and a radius of ~0.9 Rsun. We found that the inner planet, TOI-942b, hasan orbital period Pb=4.3263+-0.0011 days, a radius Rb=4.242-0.313+0.376 Rearthand a mass upper limit of 16 Mearth at 1-sigma confidence level. The outerplanet, TOI-942c, has an orbital period Pc=10.1605-0.0053+0.0056 days, a radiusRc=4.793-0.351+0.410 Rearth and a mass upper limit of 37 Mearth at 1-sigmaconfidence level.

The GAPS Programme at TNG XXVIII -- A pair of hot-Neptunes orbiting the young star TOI-942