{"paper":{"title":"Observed Type II supernova colours from the Carnegie Supernova Project-I","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A.V. Filippenko, C. Contreras, C. P. Guti\\'errez, E. Y. Hsiao, G. Folatelli, J. P. Anderson, L. Dessart, L. Galbany, M. D. Stritzinger, M. Hamuy, M. M. Phillips, N. B. Suntzeff, N. Morrell, S. Gonz\\'alez-Gait\\'an, T. de Jaeger","submitted_at":"2018-02-20T18:59:59Z","abstract_excerpt":"We present a study of observed Type II supernova (SN~II) colours using optical/near-infrared photometric data from the \\textit{Carnegie Supernovae Project-I}. We analyse four colours ($B-V$, $u-g$, $g-r$, and $g-Y$) and find that SN~II colour curves can be described by two linear regimes during the photospheric phase. The first ($s_{\\rm 1,colour}$) is steeper and has a median duration of $\\sim 40$ days. The second, shallower slope ($s_{\\rm 2,colour}$) lasts until the end of the \"plateau\" ($\\sim 80$ days). The two slopes correlate in the sense that steeper initial colour curves also imply steep"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07254","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"}