{"paper":{"title":"Early spectroscopic identification of SN 2008D","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. J. Levan, A. O. Jaunsen, B. Milvang-Jensen, B. P. Koester, C. C. Th\\\"one, C. Gall, C. Ledoux, D. Bersier, D. J. Watson, D. Malesani, D. Xu, E. Leitet, E. Rol, G. Leloudas, I. Skillen, J. Gorosabel, J. Hjorth, J. P. U. Fynbo, J. Sollerman, K. Wiersema, L. Albert, L. F. Grove, M. Bayliss, M. D. Stritzinger, M. J. Micha{\\l}owski, N. R. Tanvir, P. Jakobsson, P. M. Vreeswijk, T. Augusteijn, T. Pursimo","submitted_at":"2008-05-08T16:04:23Z","abstract_excerpt":"SN 2008D was discovered while following up an unusually bright X-ray transient in the nearby spiral galaxy NGC 2770. We present early optical spectra (obtained 1.75 days after the X-ray transient) which allowed the first identification of the object as a supernova at redshift z = 0.007. These spectra were acquired during the initial declining phase of the light curve, likely produced in the stellar envelope cooling after shock breakout, and rarely observed. They exhibit a rather flat spectral energy distribution with broad undulations, and a strong, W-shaped feature with minima at 3980 and 419"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.1188","kind":"arxiv","version":3},"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"}