{"paper":{"title":"Evidence of Asymmetry in SN 2007rt, a Type IIn Supernova","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"(2) INAF Osservatorio Astronomico di Padova, (3) Spitzer Science Center, (4) INAF Osservatorio Astronomico di Collurania, (5) SLOOH Telescopes, (6) TNG, (7) Max-Planck-Institut fur Astrophysik), A. Pastorello (1), C. Trundle (1), D. Hunter (1), F. Bufano (2), F.P. Keenan (1), I. Agnoletto (2), K. Maguire (1), M. Dolci (3), N. Elias-Rosa (4), R. Kotak (1), S. Benetti (2), S. Taubenberger (7) ((1) Queen's University Belfast, S. Valenti (1), T. Greiner (5), V. Lorenzi (6)","submitted_at":"2009-04-01T10:30:00Z","abstract_excerpt":"An optical photometric and spectroscopic analysis of the slowly-evolving Type IIn SN2007rt is presented, covering a duration of 481 days after discovery. Its earliest spectrum, taken approximately 100 days after the explosion epoch, indicates the presence of a dense circumstellar medium, with which the supernova ejecta is interacting. This is supported by the slowly-evolving light curve. A notable feature in the spectrum of SN 2007rt is the presence of a broad He I 5875 line, not usually detected in Type IIn supernovae. This may imply that the progenitor star has a high He/H ratio, having shed"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.0119","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"}