The Occurrence and Architecture of Exoplanetary Systems

TL;DR

This paper reviews current knowledge on the architecture of exoplanetary systems, including planet occurrence, orbital properties, and system configurations, highlighting recent observational insights into their diversity and structure.

Contribution

It provides a comprehensive synthesis of observational data on exoplanet system geometries, orbital parameters, and host star orientations, advancing understanding of planetary system architectures.

Findings

Exoplanet systems show diverse orbital spacings and eccentricities.

Many systems have mutual inclinations different from the Solar System.

Planet occurrence rates vary with stellar and system properties.

Abstract

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.