{"paper":{"title":"Evidence for an Instability-Induced Binary Merger in the Double-Peaked, Helium-Rich Type IIn Supernova 2023zkd","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. E. Nugent, A. Gagliano, A. Rest, C. Angus, C.-C. Lin, C. D. Kilpatrick, C. Gall, C. L. Ransome, C. McCully, D. A. Coulter, D. A. Howell, D. Farias, D. Hiramatsu, D. O. Jones, D. Tsuna, E. A. Magnier, E. P. Gonzalez, G. Narayan, G. Terreran, H. Gao, J. Farah, J. R. Fairlamb, K. A. Bostroem, K. Auchettl, K. C. Chambers, K. C. Patra, K. W. Davis, K. W. Smith, M. E. Huber, M. E. MacLeod, M. Newsome, P. D. Aleo, P. Minguez, Q. Wang, R. J. Foley, R. J. Wainscoat, S. Gomez, S. K. Yadavalli, S. Rest, S. Smartt, T. de Boer, T. Matsumoto, V. A. Villar, Y. Dong, Y. Zenati (The Young Supernova Experiment)","submitted_at":"2025-02-26T19:00:00Z","abstract_excerpt":"We present ultraviolet to infrared observations of the extraordinary Type IIn supernova 2023zkd (SN 2023zkd). Photometrically, it exhibits persistent and luminous precursor emission spanning $\\sim$4 years preceding discovery ($M_r\\approx-15$ mag, 1,500~days in the observer frame), followed by a secondary stage of gradual brightening in its final year. Post-discovery, it exhibits two photometric peaks of comparable brightness ($M_r\\lesssim-18.7$ mag and $M_r\\approx-18.4$ mag, respectively) separated by 240 days. Spectroscopically, SN 2023zkd exhibits highly asymmetric and multi-component Balmer"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.19469","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2502.19469/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}