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Gaudi, Naber & Sackett pointed out that if an event is caused by a lenssystem containing more than two planets, all planets will affect the centralregion of the magnification pattern, and thus the existence of the multipleplanets can be inferred by detecting additionally deformed anomalies fromintensive monitoring of high magnification events. Unfortunately, this methodhas important limitations in identifying the existence of multiple planets anddetermining their parameters due to the degeneracy of the resulting light curveanomalies from those induced by a single planet and the complexity of multipleplanet lensing models. In this paper, we propose a new channel to search formultiple planets via microlensing. The method is based on the fact that theanomalies induced by multiple planets are well approximated by thesuperposition of those of the single planet systems where the individualplanet-primary pairs act as independent lens systems. Then, if the sourcetrajectory passes both of the outer deviation regions induced by the individualplanets, one can unambiguously identify the existence of the multiple planets.We illustrate that the probability of successively detecting light curveanomalies induced by two Jovian-mass planets located in the lensing zonethrough this channel will be substantial. Since the individual anomalies can bewell modeled by much simpler single planet lensing models, the proposed methodhas an important advantage of allowing one to accurately determine theparameters of the individual planets.Comment: total 7 pages, including 3 figures and no table, submitted to Journal  of Korea Astronomy Society (JKAS

A NEW CHANNEL TO SEARCH FOR EXTRA-SOLAR SYSTEMS WITH MULTIPLE PLANETS VIA GRAVITATIONAL MICROLENSING