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We report the discovery of a second planet orbiting the K giant star 7 CMabased on 166 high-precision radial velocities obtained with Lick, HARPS, UCLESand SONG. The periodogram analysis reveals two periodic signals ofapproximately 745 and 980 d, associated to planetary companions. Adouble-Keplerian orbital fit of the data reveals two Jupiter-like planets withminimum masses $m_b\sin i \sim 1.9 \,\mathrm{M_{J}}$ and $m_c\sin i \sim 0.9\,\mathrm{M_{J}}$, orbiting at semi-major axes of $a_b \sim 1.75\,\mathrm{au}$and $a_c \sim 2.15\,\mathrm{au}$, respectively. Given the small orbitalseparation and the large minimum masses of the planets close encounters mayoccur within the time baseline of the observations, thus, a more accurateN-body dynamical modeling of the available data is performed. The dynamicalbest-fit solution leads to collision of the planets and we explore thelong-term stable configuration of the system in a Bayesian framework,confirming that 13% of the posterior samples are stable for at least 10 Myr.The result from the stability analysis indicates that the two-planets aretrapped in a low-eccentricity 4:3 mean-motion resonance. This is only the thirddiscovered system to be inside a 4:3 resonance, making it very valuable forplanet formation and orbital evolution models.

Precise radial velocities of giant stars XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system