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Short- to mid-term magnetic phenomena on the stellar surface of M-type starscannot only resemble the effects of planets in radial velocity data, but alsomay hide them. We analyze 145 spectroscopic HARPS-N observations of GJ 3942taken over the past five years and additional photometry to disentangle stellaractivity effects from genuine Doppler signals as a result of the orbital motionof the star around the common barycenter with its planet. To achieve this, weuse the common methods of pre-whitening, and treat the correlated red noise bya first-order moving average term and by Gaussian-process regression followingan MCMC analysis. We identify the rotational period of the star at 16.3 daysand discover a new super-Earth, GJ 3942 b, with an orbital period of 6.9 daysand a minimum mass of 7.1 Me. An additional signal in the periodogram of theresiduals is present but we cannot claim it to be related to a second planetwith sufficient significance at this point. If confirmed, such planet candidatewould have a minimum mass of 6.3 Me and a period of 10.4 days, which mightindicate a 3:2 mean-motion resonance with the inner planet.

HADES RV Programme with HARPS-N at TNG VI. GJ 3942 b behind dominant activity signals