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Since low-mass stars have low luminosities, orbits at which liquid water canexist on Earth-sized planets are relatively close-in, which produces Dopplersignals that are detectable using state-of-the-art Doppler spectroscopy. GJ667C is already known to be orbited by two super-Earth candidates. Weinvestigate whether the data supports the presence of additional companions. Weobtain new Doppler measurements from HARPS extracted spectra and combined themwith those obtained from the PFS and HIRES spectrographs. We used Bayesian andperiodogram-based methods to re-assess the number of candidates and evaluatedthe confidence of each detection. Among other tests, we validated the planetcandidates by analyzing correlations of each Doppler signal activity indicesand investigate quasi-periodicity. Doppler measurements of GJ 667C aredescribed better by six Keplerian-like signals: the two known candidates (b andc); three additional few-Earth mass candidates with periods of 92, 62 and 39days (d, e and f); a cold super-Earth in a 260-day orbit (g) and tantalizingevidence of a $\sim$ 1 M$_\oplus$ object in a close-in orbit of 17 days (h). Weexplore whether long-term stable orbits are compatible with the data byintegrating 8$\times 10^4$ solutions derived from the Bayesian samplings. Thesystem consisting of six planets is compatible with dynamically stableconfigurations. As for the solar system, the most stable solutions do notcontain mean-motion resonances and are described well by analyticLaplace-Lagrange solutions. The presence of a seventh planet (h) is supportedby the fact that it appears squarely centered on the only island of stabilityleft in the six-planet solution. Habitability assessments accounting for thestellar flux, as well as tidal dissipation effects, indicate that three (maybefour) planets are potentially habitable...

A dynamically-packed planetary system around GJ667C with three super-Earths in its habitable zone