Paper:	Extrasolar Planets and Mean-Motion Resonances
Volume:	294, Scientific Frontiers in Research on Extrasolar Planets
Page:	197
Authors:	Lee, M. H.; Peale, S. J.
Abstract:	The 2:1 orbital resonances of the GJ876 system can be easily established by the differential planet migration due to planet-nebula interaction. Significant eccentricity damping is required to produce the observed orbital eccentricities. The geometry of the GJ876 resonance configuration differs from that of the Io-Europa pair, and this difference is due to the magnitudes of the eccentricities involved. We show that a large variation in the configuration of 2:1 and 3:1 resonances and, in particular, asymmetric librations can be expected among future discoveries.

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