{"paper":{"title":"Observations of SN 2017ein Reveal Shock Breakout Emission and A Massive Progenitor Star for a Type Ic Supernova","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alexey Tolstov, A. Rest, Curtis McCully, D. Andrew Howell, Danfeng Xiang, Davron Mirzaqulov, E. Baron, Griffin Hosseinzadeh, Hao Song, James M DerKacy, J. Craig Wheeler, Jozsef Vinko, Jujia Zhang, Jun Mo, Kaicheng Zhang, Ken'ichi Nomoto, Lingjun Wang, Morgan Fraser, Peter Brown, Sergei Blinnikov, Shaolan Bi, Shuhrat A. Ehgamberdiev, Stephen Smartt, Tianmeng Zhang, Xianfei Zhang, Xiaofeng Wang","submitted_at":"2018-12-07T15:53:25Z","abstract_excerpt":"We present optical and ultraviolet observations of nearby type Ic supernova SN 2017ein as well as detailed analysis of its progenitor properties from both the early-time observations and the prediscovery Hubble Space Telescope (HST) images. The optical light curves started from within one day to $\\sim$275 days after explosion, and optical spectra range from $\\sim$2 days to $\\sim$90 days after explosion. Compared to other normal SNe Ic like SN 2007gr and SN 2013ge, \\mbox{SN 2017ein} seems to have more prominent C{\\footnotesize II} absorption and higher expansion velocities in early phases, sugg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.03076","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"}