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Fig. 20.

Rotational period vs. age for the TRAPPIST–1 analogs, compared with M = 0.09 M⊙ evolutionary tracks from Baraffe et al. (2015), assuming angular momentum conservation with different initial Prot values. The dashed line shows the breakup period Pcrit[days] = 0.116(R/R⊙)3/2(M/M⊙)−1/2 from Herbst et al. (2001).
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