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Kozlowski, S.-L. Kim, S.-M. Cha, W. Zhu, Y.-H. Ryu, Y. K. Jung, Y. Lee, Y. Shvartzvald","submitted_at":"2017-09-25T13:21:17Z","abstract_excerpt":"We present microlensing planet OGLE-2017-BLG-0173Lb, with planet-host mass ratio either $q\\simeq 2.5\\times 10^{-5}$ or $q\\simeq 6.5\\times 10^{-5}$, the lowest or among the lowest ever detected. The planetary perturbation is strongly detected, $\\Delta\\chi^2\\sim 10,000$, because it arises from a bright (therefore, large) source passing over and enveloping the planetary caustic: a so-called \"Hollywood\" event. 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