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A re-analysis of Gliese 667C HARPS precision radial velocity data was carriedout with a Bayesian multi-planet Kepler periodogram (from 0 to 7 planets) basedon a fusion Markov chain Monte Carlo algorithm. The most probable number ofsignals detected is 6 with a Bayesian false alarm probability of 0.012. Theresiduals are shown to be consistent with white noise. The 6 signals detectedinclude two previously reported with periods of 7.198 (b) and 28.14 (c) days,plus additional periods of 30.82 (d), 38.82 (e), 53.22, and 91.3 (f) days. The53 day signal is probably the second harmonic of the stellar rotation periodand is likely the result of surface activity. The existence of the additonalKeplerian signals suggest the possibilty of further planets, two of which (dand e) could join Gl 667Cc in the central region of the habitable zone. N-bodysimulations are required to determine which of these signals are consistentwith a stable planetary system. $M \sin i$ values corresponding to signals b,c, d, e, and f are $\sim$ 5.4, 4.8, 3.1, 2.4, and 5.4 M$_{\earth}$,respectively.

Additional Keplerian Signals in the HARPS data for Gliese 667C from a Bayesian Re-analysis