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Potentially habitable planets within the habitable zone of M-dwarfs areaffected by tidal interaction. We studied the tidal evolution in GJ 667C usinga numerical code we call TIDEV. We reviewed the problem of the dynamicalevolution focusing on the effects that a rheological treatment, differentcompositions and the inclusion of orbital perturbations, have on the spin-downtime and the probability to be trapped in a low spin-orbit resonance.Composition have a strong effect on the spin-down time, changing, in somecases, by almost a factor of 2 with respect to the value estimated for areference Earth-like model. We calculated the time to reach a low resonancevalue (3:2) for the configuration of 6 planets. Capture probabilities areaffected when assuming different compositions and eccentricities variations. Wechose planets b and c to evaluate the probabilities of capture in resonancesbelow 5:2 for two compositions: Earth-like and Waterworld planets. We foundthat perturbations, although having a secular effect on eccentricities, have alow impact on capture probabilities and noth- ing on spin-down times. Theimplications of the eccentricity variations and actual habitability of the GJ667C system are discussed.

The Spin-Orbit Evolution of GJ 667C System: The Effect of Composition and Other Planet's Perturbations