The multiplicity fraction of field stars is almost 50% . The study of exoplanets in the context of binaries is thus of crucial importance, given that binarity should be a relatively common environment. I will present the first complete census of known planet-hosting binaries, derived from intense literature and catalogue search. Our sample lists 728 systems (of which 77 are triples or quadruples) with « S-type » orbits (planet orbiting one star of a binary pair) as well as 31 circumbinary systems (« P-type » orbits).
Despite the great heterogeneity of our sources and the multiple biaises that affect the planet-hosting binary population (adverse selection effect in RV surveys, difficulty of finding close-in companions in deep imaging searches, …), I will show that some robust statistical trends can be derived. Our main result is that, contrary to what was claimed in some earlier studies, the observed depletion of planet-hosting close-in binaries (
