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Although the 55 Cnc system contains multiple, closely packed planets that arepresumably in a coplanar configuration, we use numerical simulations todemonstrate that they are likely to be highly inclined to their parent star'sspin axis. Due to perturbations from its distant binary companion, thisplanetary system precesses like a rigid body about its parent star.Consequently, the parent star's spin axis and the planetary orbit normal likelydiverged long ago. Because only the projected separation of the binary isknown, we study this effect statistically, assuming an isotropic distributionfor wide binary orbits. We find that the most likely projected spin-orbit angleis ~50 degrees, with a ~30% chance of a retrograde configuration. Transitobservations of the innermost planet - 55 Cnc e - may be used to verify thesefindings via the Rossiter-McLaughlin effect. 55 Cancri may thus represent a newclass of planetary systems with well-ordered, coplanar orbits that are inclinedwith respect to the stellar equator.

55 Cancri: A Coplanar Planetary System that is Likely Misaligned with its Star