Light curves for the Kepler-16 system, adapted from Doyle et al. (2011)[3]
The Kepler-16 system is almost edge-on to Earth and the two stars eclipse each other as they orbit. The larger and brighter primary star is partially eclipsed by the secondary for about six hours and the brightness drops by about 0.15 magnitudes. The secondary star is completely occulted by the primary star for about two hours, but the overall brightness only drops by about 0.02 magnitudes.
There are also shallow eclipses caused by a large exoplanet. When this transits across the primary star, the brightness drops by slightly more than the secondary eclipse. When it transits the secondary star, the brightness drops by 0.001 magnitudes.[3]
Kepler-16b is a gas giant that orbits the two stars in the Kepler-16 system.[3] The planet is a third of Jupiter's mass and slightly smaller than Saturn at 0.7538 Jupiter radii, but is more dense. Kepler-16b completes a nearly circular orbit every 228.776 days.