{"paper":{"title":"Analysis of the Early-Time Optical Spectra of SN 2011fe in M101","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. Sternberg, A. V. Filippenko, B. Dilday, B. Friesen, C. Buton, D. A. Howell, D. Bersier, D. Levitan, D. Milisavljevic, D. Polishook, D. Poznanski, D. Xu, E. Baron, E. O. Ofek, E. S. Walker, F. B. Bianco, I. Arcavi, J. Bloom, J. M. Silverman, J. T. Parrent, K. Maguire, L. Bildsten, M. M. Kasliwal, M. Sullivan, N. Konidaris, N. M. Law, P. A. Mazzali, P. Nugent, R. A. Fesen, R. C. Thomas, R. M. Quimby, R. Pereira, S. B. Cenko, S. Ben-Ami, S. R. Kulkarni, Y. Cao, Y. Pan","submitted_at":"2012-05-28T00:39:09Z","abstract_excerpt":"The nearby Type Ia supernova SN 2011fe in M101 (cz=241 km s^-1) provides a unique opportunity to study the early evolution of a \"normal\" Type Ia supernova, its compositional structure, and its elusive progenitor system. We present 18 high signal-to-noise spectra of SN 2011fe during its first month beginning 1.2 days post-explosion and with an average cadence of 1.8 days. This gives a clear picture of how various line-forming species are distributed within the outer layers of the ejecta, including that of unburned material (C+O). We follow the evolution of C II absorption features until they di"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.6011","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"}