{"paper":{"title":"OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. Gould, A. Udalski, B.-G. Park, C. Han, C.-U. Lee, D.-J. Kim, D.-J. Lee, H.-W. Kim, I.-G. Shin, I. Soszy\\'nski, J. C. Yee, J. Skowron, K.-H. Hwang (and), K. Rybicki, K. Ulaczyk, M. D. Albrow, M. K. Szyma\\'nski, M. Pawlak, P. Iwanek (OGLE Collaboration), P. Mr\\'oz, P. Pietrukowicz, R. Poleski, R. W. Pogge (KMTNet Collaboration), S.-J. Chung, S. 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\". We trace the mathematical origins of this degeneracy, which should enable similar degenerate solutions to b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.10067","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}