Tides, planetary companions, and habitability: habitability in the habitable zone of low-mass stars

@article{Laerhoven2014TidesPC,
  title={Tides, planetary companions, and habitability: habitability in the habitable zone of low-mass stars},
  author={Christa L. Van Laerhoven and Rory Barnes and Richard Greenberg},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={441},
  pages={1888-1898}
}
Earth-scale planets in the classical habitable zone (HZ) are more likely to be habitable if they possess active geophysics. Without a constant internal energy source, planets cool as they age, eventually terminating tectonic activity and rendering the planet sterile to life. However, for planets orbiting low-mass stars, the presence of an outer companion could generate enough tidal heat in the HZ planet to prevent such cooling. The range of mass and orbital parameters for the companion that… 
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