{"paper":{"title":"Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. C. Becker, A. Clocchiatti, A. G. Riess, A. Miceli, A. Rest, A. V. Filippenko, B. Barris, B. Leibundgut, B. P. Schmidt, C. Aguilera, C. W. Stubbs, D. Branch, G. Miknaitis, G. Pignata, J. L. Prieto, J. L. Tonry, J. Sollerman, J. Spyromilio, K. Krisciunas, L. Dessart, M. E. Salvo, M. Hicken, N. B. Suntzeff, P. Challis, P. Garnavich, P. Hoeflich, R. Chornock, R. Covarrubias, R. C. Smith, R. J. Foley, R. P. Kirshner, S. Blondin, S. Jha, T. Davis, T. Matheson, W. Li, W. M. Wood-Vasey","submitted_at":"2005-10-04T17:12:15Z","abstract_excerpt":"Using archival data of low-redshift (z < 0.01) Type Ia supernovae (SN Ia) and recent observations of high-redshift (0.16 < z <0.64; Matheson et al. 2005) SN Ia, we study the \"uniformity'' of the spectroscopic properties of nearby and distant SN Ia. We find no difference in the measures we describe here. In this paper, we base our analysis solely on line-profile morphology, focusing on measurements of the velocity location of maximum absorption (vabs) and peak emission (vpeak). We find that the evolution of vabs and vpeak for our sample lines (Ca II 3945, Si II 6355, and S II 5454, 5640) is sim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0510089","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"}