{"paper":{"title":"450 Days of Type II SN 2013ej in Optical and Near-Infrared","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Gal-Yam, A. Jerkstrand, A. J. Ruiter, A. Mehner, A. Pastorello, B. E. Tucker, B. P. Schmidt, C. Barbarino, C. Fremling, C. Inserra, D. A. Howell, D. R. Young, E. Kankare, Fang Yuan, F. Taddia, G. Terreran, I. R. Seitenzahl, J. Sollerman, K. L. Li, K. Maguire, L. Tomasella, M. Fraser, M. J. Childress, M. Sullivan, M. Y. Lee, N. Elias-Rosa, P. Ochner, R. Kotak, S. Benetti, S. J. Smartt, S. Margheim, S. Schulze, S. Valenti, T.-W. Chen","submitted_at":"2016-05-19T20:00:02Z","abstract_excerpt":"We present optical and near-infrared photometric and spectroscopic observations of SN 2013ej, in galaxy M74, from 1 to 450 days after the explosion. SN 2013ej is a hydrogen-rich supernova, classified as a Type IIL due to its relatively fast decline following the initial peak. It has a relatively high peak luminosity (absolute magnitude M$_\\rm{V}$ = -17.6) but a small $^{56}$Ni production of ~0.023 M$_\\odot$. Its photospheric evolution is similar to other Type II SNe, with shallow absorption in the H{\\alpha} profile typical for a Type IIL. During transition to the radioactive decay tail at ~100"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.06117","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"}