Philippe Thbault Paris Observatory Planet formation in binaries Planet formation in binaries why bother? a majority of stars in multiple systems >80 detected exoplanets in binaries testbed for planet-formation scenarios Outline I Introduction - exoplanets in binaries - orbital stability II Planet formation: the different stages that can go wrong - disc truncation / grain condensation - embryo formation III Planetesimal accretion IV Light at the end of the tunnel? ~80 planets in binaries (Desidera & Barbieri, 2007) Exoplanets in Binaries (Raghavan et al., 2006) Gliese 86 HD 41004A Cephei Exoplanets in Binaries ~23% of detected extrasolar planets in multiple systems But... (Raghavan et al., 2006, Desidera&Barbieri, 2007) Exoplanets in Binaries ~2-3% ( 4-5 systems ) in close binaries with a b