{"paper":{"title":"The lowest metallicity type II supernova from the highest mass red-supergiant progenitor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Jerkstrand, C. Agliozzo, C. Contreras, C. Gonzalez, C. Inserra, C. P. Guti\\'errez, D. R. Young, E. Kankare, E. Magnier, E. Y. Hsiao, G. Hosseinzadeh, H. Flewelling, J. P. Anderson, J. Sollerman, K. C. Chambers, K. Maguire, L. Dessart, L. Galbany, M. D. Stritzinger, M. Fraser, M. Huber, M. M. Phillips, M. Sullivan, N. Morrell, S. Castell\\'on, S. Gonz\\'alez-Gait\\'an, S. J. Smartt, S. Mattila, S. Valenti, T. B. Lowe, T. Kr\\\"uhler, T.-W. Chen","submitted_at":"2018-05-11T14:57:17Z","abstract_excerpt":"Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae. However, while such stars are observed with masses >25M$_\\odot$, detections of >18M$_\\odot$ progenitors remain elusive. Red supergiants are also expected to form at all metallicities, but discoveries of explosions from low-metallicity progenitors are scarce. Here, we report observations of the type II supernova, SN 2015bs, for which we infer a progenitor metallicity of $\\leq$0.1Z$_\\odot$ from comparison to photospheric-phase spectral models, and a Zero Age Main-Sequence mass of 17-2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04434","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"}