Luca Biasco, Luigi Chierchia, Enrico Valdinoci
$N$-dimensional invariant tori for the planar $(N+1)$-body problem
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ABSTRACT.  For any $N\geq 2$ we prove the existence of quasi--periodic 
orbits lying on $N$--dimensional invariant elliptic 
tori for the planetary planar $(N+1)$--body problem. For concreteness, we 
focus on a caricature of the outer solar system.