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We present new radial velocities from Keck Observatory and both Newtonian andKeplerian solutions for the triple-planet system orbiting HD 37124. The orbitalsolution for this system has improved dramatically since the third planet wasfirst reported in Vogt et al. 2005 with an ambiguous orbital period. We haveresolved this ambiguity, and the outer two planets have an apparent periodcommensurability of 2:1. A dynamical analysis finds both resonant andnon-resonant configurations consistent with the radial velocity data, andconstrains the mutual inclinations of the planets to be less than about 30degrees. We discuss HD 37124 in the context of the other 19 exoplanetarysystems with apparent period commenserabilities, which we summarize in a table.We show that roughly one in three well-characterized multiplanet systems has aapparent low-order period commensuribility, which is more than would naively beexpected if the periods of exoplanets in known multiplanet systems were drawnrandomly from the observed distribution of planetary orbital periods.

The California Planet Survey III. A Possible 2:1 Resonance in the Exoplanetary Triple System HD 37124