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Chang-Refsdal (C-R) lensing, which refers to the gravitational lensing of apoint mass perturbed by a constant external shear, provides a goodapproximation in describing lensing behaviors of either a very wide or a veryclose binary lens. C-R lensing events, which are identified by short-termanomalies near the peak of a high-magnification lensing light curves, areroutinely detected from lensing surveys, but not much attention is paid tothem. In this paper, we point out that C-R lensing events provide an importantchannel to detect planets in binaries, both in close and wide binary systems.Detecting planets through the C-R lensing event channel is possible because theplanet-induced perturbation occurs in the same region of the C-Rlensing-induced anomaly and thus the existence of the planet can be identifiedby the additional deviation in the central perturbation. By presenting theanalysis of the actually observed C-R lensing event OGLE-2015-BLG-1319, wedemonstrate that dense and high-precision coverage of a C-R lensing-inducedperturbation can provide a strong constraint on the existence of a planet inthe wide range of the planet parameters. The sample of an increased number ofmicrolensing planets in binary systems will provide important observationalconstraints in giving shape to the details of the planet formation scenariowhich has been restricted to the case of single stars.

Detections of Planets in Binaries Through the Channel of Chang-Refsdal Gravitational Lensing Events