Tidal damping of the mutual inclination in hierarchical systems

@article{Correia2013TidalDO,
  title={Tidal damping of the mutual inclination in hierarchical systems},
  author={Alexandre C. M. Correia and Gwena{\"e}l Bou{\'e} and Jacques Laskar and M H M Morais},
  journal={Astronomy and Astrophysics},
  year={2013},
  volume={553}
}
Hierarchical two-planet systems, in which the inner body's semi-major axis is between 0.1 and 0.5 AU, usually present high eccentricity values, at least for one of the orbits. As a result of the formation process, one may expect that planetary systems with high eccentricities also have high mutual inclinations. However, here we show that tidal effects combined with gravitational interactions damp the initial mutual inclination to modest values in timescales that are shorter than the age of the… 
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