Transits and Occultations

TL;DR

Eclipses in exoplanetary systems, such as transits and occultations, provide crucial information about planetary sizes, atmospheres, and system architecture, advancing our understanding beyond radial-velocity data.

Contribution

This chapter reviews the geometry, physics, and recent discoveries related to exoplanetary eclipses, highlighting their importance in characterizing exoplanets.

Findings

Eclipse observations reveal planetary and stellar dimensions.

Wavelength dependence informs atmospheric composition.

Timing anomalies can indicate additional planets or moons.

Abstract

When we are fortunate enough to view an exoplanetary system nearly edge-on, the star and planet periodically eclipse each other. Observations of eclipses (transits and occultations) provide a bonanza of information that cannot be obtained from radial-velocity data alone, such as the relative dimensions of the planet and its host star, as well as the orientation of the planet's orbit relative to the sky plane and relative to the stellar rotation axis. The wavelength-dependence of the eclipse signal gives clues about the the temperature and composition of the planetary atmosphere. Anomalies in the timing or other properties of the eclipses may betray the presence of additional planets or moons. Searching for eclipses is also a productive means of discovering new planets. This chapter reviews the basic geometry and physics of eclipses, and summarizes the knowledge that has been gained through eclipse observations, as well as the information that might be gained in the future.