Long-term precise Doppler measurements with the CORALIE spectrograph reveal the presence of a second planet orbiting the solar-type star HD 202206 .
The radial-velocity combined fit yields companion masses of m _ { 2 } \sin i = 17.4 M _ { Jup } and 2.44 M _ { Jup } , semi-major axes of a = 0.83 AU and 2.55 AU , and eccentricities of e = 0.43 and 0.27 , respectively .
A dynamical analysis of the system further shows a 5/1 mean motion resonance between the two planets .
This system is of particular interest since the inner planet is within the brown-dwarf limits while the outer one is much less massive .
Therefore , either the inner planet formed simultaneously in the protoplanetary disk as a superplanet , or the outer Jupiter-like planet formed in a circumbinary disk .
We believe this singular planetary system will provide important constraints on planetary formation and migration scenarios .