{"paper":{"title":"The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A.Bhattacharya, A.Fukui, A.Sharan, A.Yonehara, C.H.Ling, D.J.Sullivan, D.P.Bennett, D.Suzuki, F.Abe, H.Oyokawa, H.Shibai, I.A.Bond, K.Masuda, K.Onishi, L.A.Rogers, M.C.A.Li, M.Donachie, M.Freeman, M.Nagakane, N.Koshimoto, N.Rattenbury, P.J.Tristram, To.Saito, T.Sumi, Y.Asakura, Y.Hirao, Y.Itow, Y.Matsubara, Y.Muraki","submitted_at":"2016-12-12T21:35:38Z","abstract_excerpt":"We report the results of the statistical analysis of planetary signals discovered in MOA-II microlensing survey alert system events from 2007 to 2012. We determine the survey sensitivity as a function of planet-star mass ratio, $q$, and projected planet-star separation, $s$, in Einstein radius units. We find that the mass ratio function is not a single power-law, but has a change in slope at $q \\sim 10^{-4}$, corresponding to $\\sim 20 M_{\\oplus}$ for the median host star mass of $\\sim 0.6 M_{\\odot}$. We find significant planetary signals in 23 of the 1474 alert events that are well characteriz"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.03939","kind":"arxiv","version":1},"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"}