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Precise radial-velocity measurements with the HARPS spectrograph reveal thepresence of two planets orbiting the solar-type star HD45364. The companionmasses are 0.187 Mjup and 0.658 Mjup, with semi-major axes of 0.681 AU and0.897 AU, and eccentricities of 0.168 and 0.097, respectively. A dynamicalanalysis of the system further shows a 3:2 mean motion resonance between thetwo planets, which prevents close encounters and ensures the stability of thesystem over 5 Gyr. This is the first time that such a resonant configurationhas been observed for extra-solar planets, although there is an analogue in ourSolar System formed by Neptune and Pluto. This singular planetary system mayprovide important constraints on planetary formation and migration scenarios.

HD45364, a pair of planets in a 3:2 mean motion resonance