The Occurrence and Architecture of Exoplanetary Systems

The basic geometry of the Solar System—the shapes, spacings, and orientations of the planetary orbits—has long been a subject of fascination as well as inspiration for planet-formation theories. For exoplanetary systems, those same properties have only recently come into focus. Here we review our current knowledge of the occurrence of planets around other stars, their orbital distances and eccentricities, the orbital spacings and mutual inclinations in multiplanet systems, the orientation of the host star’s rotation axis, and the properties of planets in binary-star systems. 409 Review in Advance first posted online on June 18, 2015. (Changes may still occur before final publication online and in print.) Changes may still occur before final publication online and in print A nn u. R ev . A st ro . A st ro ph ys . 2 01 5. 53 . D ow nl oa de d fr om w w w .a nn ua lr ev ie w s. or g A cc es s pr ov id ed b y C or ne ll U ni ve rs ity o n 07 /2 4/ 15 . F or p er so na l u se o nl y. AA53CH11-Winn ARI 10 June 2015 10:43