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With the discoveries of very close star-planet systems with planet orbitingsometimes at several star radius but also with well-known situations in oursolar system where natural satellites are very close to their parent planet thevalidity of the ponctual mass approximation for the tidal perturber(respectively the parent star or planet when we study the close planet ornatural satellite dynamics) has to be examined. In this short paper, weconsider this problematic using results coming from a complete formalism thatallows to treat the tidal interaction between extended bodies. We focus on itsapplication to a simplified configuration.

Is it necessary to go beyond the ponctual mass approximation for tidal perturber in close systems?