{"paper":{"title":"Observational signature of circumstellar interaction and $\\rm ^{56}$Ni-mixing in the Type II Supernova 2016gfy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Avinash Singh, Brajesh Kumar, D.K. Sahu, G.C. Anupama, Jennifer E. Andrews, Nathan Smith, Peter J. Brown, Takashi J. Moriya","submitted_at":"2019-07-06T17:43:21Z","abstract_excerpt":"The optical and ultra-violet broadband photometric and spectroscopic observations of the Type II supernova (SN) 2016gfy are presented. The $V$-band light curve (LC) shows a distinct plateau phase with a slope, $s_2$ $\\sim$ 0.12 mag / 100 d and a duration of 90 $\\pm$ 5 d. Detailed analysis of SN 2016gfy provided a mean $\\rm^{56}Ni$ mass of 0.033 $\\pm$ 0.003 $\\rm M_{\\odot}$, a progenitor radius of $\\sim$ 350-700 $\\rm R_{\\odot}$, a progenitor mass of $\\sim$ 12-15 $\\rm M_{\\odot}$ and an explosion energy of 0.9-1.4$\\rm \\times 10^{51}\\ erg\\ s^{-1}$. The P-Cygni profile of H$\\rm \\alpha$ in the early "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.03159","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.03159/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}