Tidal evolution of the spin properties of planet GJ 667C f. Solid lines depict predictions from constant-time-lag theory (“CTL”), while dashed lines illustrate those from a constant-phase-lag model (“CPL”). All tracks assume a scenario similar to the “base” configuration (see text and Table 9). Left: despinning for an assumed initial rotation period of one day. The CPL model yields tidal locking in less than 5 Myr, and CTL theory predicts about 20 Myr for tidal locking. Right: tilt erosion of an assumed initial Earth-like obliquity of 23.5°. Time scales for both CPL and CTL models are similar to the locking time scales.