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The stellar spin orientation relative to the orbital planes of multiplanetsystems are becoming accessible to observations. For example, 55 Cancri is asystem composed of 5 planets orbiting a member of a stellar binary for which aprojected obliquity of 72+-12 deg relative to the orbit of the innermost planethas been reported (Bourrier & Hebrard 2014). This large obliquity has beenattributed to the perturbation induced by the binary. Here we describe thesecular evolution of similar systems and we discuss the case of the 55 Cancrisystem more deeply. We provide two different orbital configurations compatiblewith the currently available observations.

Spin-orbit angle in compact planetary systems perturbed by an inclined companion. Application to the 55 Cancri system