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Koz{\\l}owski, S.-L. Kim, S.-M. Cha, W. Zang, W. Zhu, Y.-H. Ryu, Y. K. Jung, Y. Lee, Y. Shvartzvald","submitted_at":"2018-02-27T18:48:09Z","abstract_excerpt":"We report the discovery of microlensing planet OGLE-2017-BLG-0373Lb. We show that while the planet-host system has an unambiguous microlens topology, there are two geometries within this topology that fit the data equally well, which leads to a factor 2.5 difference in planet-host mass ratio, i.e., $q=1.5\\times 10^{-3}$ vs. $q=0.6\\times 10^{-3}$. We show that this is an \"accidental degeneracy\" in the sense that it is due to a gap in the data. We dub it \"the caustic-chirality degeneracy\". 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