Habitability of Extrasolar Planets and Tidal Spin Evolution

  title={Habitability of Extrasolar Planets and Tidal Spin Evolution},
  author={Ren{\'e} Heller and Rory Barnes and J{\'e}r{\'e}my Leconte},
  journal={Origins of Life and Evolution of Biospheres},
Stellar radiation has conservatively been used as the key constraint to planetary habitability. We review here the effects of tides, exerted by the host star on the planet, on the evolution of the planetary spin. Tides initially drive the rotation period and the orientation of the rotation axis into an equilibrium state but do not necessarily lead to synchronous rotation. As tides also circularize the orbit, eventually the rotation period does equal the orbital period and one hemisphere will be… 

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