Transits and Occultations

Understand

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.