Detecting companions to extrasolar planets using mutual events

Abstract
Aims.We investigate a new approach to the detection of companions to extrasolar planets beyond the transit method. We discuss the possibility of the existence of "binary planets".
Methods.We develop a method based on the imaging of a planet-companion as an unresolved system (but resolved from its parent star). It makes use of planet-companion "mutual phenomena", namely mutual transits and mutual shadows.
Results.We show that companions can be detected and their radius measured down to lunar sizes.

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