2008ApJ...676L..53H

Among more than 200 extrasolar planet candidates discovered to date, there is no known planet orbiting around normal binary stars. In this Letter, we demonstrate that microlensing is a technique that can detect such planets. Microlensing discoveries of these planets are possible because the planet and host binary stars produce perturbations at a common region around center of mass of the binary stars and thus the signatures of both planet and binary can be detected in the light curves of high-magnification microlensing events. The ranges of the planetary and binary separations of systems for optimal detection vary depending on the planet mass. For a Jupiter-mass planet, we find that high detection efficiency is expected for planets located in the range of ∼1-5 AU from the binary stars which are separated by ∼0.15-0.5 AU.