{"paper":{"title":"Verifying the Cosmological Utility of Type Ia Supernovae: Implications of a Dispersion in the Ultraviolet Spectra","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) University of Toronto, 3), (3) University of Oxford Astrophysics, (4) LBNL, (5) LPHNE, (6) University of Victoria, (7) LAM CNRS, (8) CPPM), A. Conley (2), A. Gal-Yam (1), C. Balland (5), C. J. Pritchet (6), CNRS-IN2P3, D. A. Howell (2), D. Balam (6), D. Fouchez (8), D. Hardin (5), I. Hook (3), J. Guy (5), K. Perrett (2), M. Sullivan (2, N. Regnault (5) ((1) Caltech, P. Astier (5), P. E. Nugent (4), R. G. Carlberg (2), R. Pain (5), R. S. Ellis (1), S. Basa (7), University of Paris VI, VII","submitted_at":"2007-10-22T15:34:53Z","abstract_excerpt":"We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe Ia) and its dispersion using high signal-to-noise Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for removing host galaxy contamination in our spectra, exploiting the comprehensive photometric coverage of the SNLS SNe and their host galaxies, thereby providing the first quantitative view of the UV spectral properties of a large sample of distant SNe Ia. Although the m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0710.3896","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":""},"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"}