{"paper":{"title":"Spectroscopic Observations of SN 2012fr: A Luminous Normal Type Ia Supernova with Early High Velocity Features and Late Velocity Plateau","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.CO","authors_text":"A. Gal-Yam, A. V. Filippenko, B. E. Schaefer, B. E. Tucker, B. P. Schmidt, C. Contreras, C. de Burgh-Day, C. Lidman, C. McCully, D. D. R. Bayliss, D. J. Carson, E. L. Gates, E. Y. Hsiao, F. Bufano, F. Forster, F. P. A. Vogt, F. Taddia, F. Yuan, G. A. Blanc, G. Pignata, G. Zhou, I-T. Ho, J. A. Rich, J. J. Fang, J. Maund, J. M. Silverman, J. P. Anderson, J. R. Mould, J. Spyromilio, K. I. Clubb, K. Maguire, L. Le Guillou, L. Pei, M. Bessell, M. B. Pracy, M. J. Childress, M. Owers, M. Phillips, M. Stritzinger, M. Sullivan, N. Morrell, N. Scott, N. S. Loaring, O. D. Fox, P. A. Mazzali, P. L. Kelly, R. A. Scalzo, S. A. Sim, S. B. Cenko, S. Benetti, S. Keller, S. Ozbilgen, S. Smartt, S. Valenti, S. W. Jha, T. D. Desjardins, T. de Jaeger, T. Pickering","submitted_at":"2013-02-12T21:07:05Z","abstract_excerpt":"We present 65 optical spectra of the Type Ia supernova SN 2012fr, of which 33 were obtained before maximum light. At early times SN 2012fr shows clear evidence of a high-velocity feature (HVF) in the Si II 6355 line which can be cleanly decoupled from the lower velocity \"photospheric\" component. This Si II 6355 HVF fades by phase -5; subsequently, the photospheric component exhibits a very narrow velocity width and remains at a nearly constant velocity of v~12,000 km/s until at least 5 weeks after maximum brightness. The Ca II infrared (IR) triplet exhibits similar evidence for both a photosph"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.2926","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"}