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Tidally locked worlds provide a unique opportunity for constraining theprobable climates of certain exoplanets. They are unique in that few exoplanetspin and obliquity states are known or will be determined in the near future:both of which are critical in modeling climate. A recent study shows thedynamical conditions present in the TRAPPIST-1 system make rotation and largelibrations of the substellar point possible for these planets, which areusually assumed to be tidally locked. We independently confirm the tendency forplanets in TRAPPIST-1-like systems to sporadically transition from tidallylocked libration to slow rotation using N-body simulations. We examine thenature and frequency of these spin states to best inform energy balance modelswhich predict the temperature profile of the planet's surface. Our findingsshow that tidally locked planets with sporadic rotation are able to be in bothlong-term persistent states and states with prolonged transient behavior: wherefrequent transitions between behaviors occur. Quasi-stable spin regimes, wherethe planet exhibits one spin behavior for up to hundreds of millennia, arelikely able to form stable climate systems while the spin behavior is constant.1D energy balance models show that tidally locked planets with sporadicrotation around M-dwarfs will experience a relatively small change insubstellar temperature due to the lower albedo of ice in an infrared dominantstellar spectrum. The exact effects of large changes in temperature profiles onthese planets as they rotate require more robust climate models, like 3D globalcirculation models, to better examine.

Day and Night: Habitability of Tidally Locked Planets with Sporadic Rotation