{"paper":{"title":"Double \"acct\": a distinct double-peaked supernova matching pulsational pair-instability models","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Aamer, A. Clocchiatti, A. Gagliano, A. Rest, C.-C. Lin, C. Gall, C. L. Ransome, C. R. Angus, D. A. Coulter, D. Farias, D. O. Jones, E. A. Magnier, E. Ramirez-Ruiz, G. Dimitriadis, G. Narayan, H. F. Stevance, H. Gao, K. Auchettl, K. C. Chambers, K. Taggart, K. W. Smith, L. Izzo, M. D. Fulton, M. Nicholl, M. Pursiainen, M. R. Drout, M. R. Siebert, N. Khetan, P. Ramsden, R. J. Foley, S. E. Woosley, S. J. Smartt, S. K. Yadavalli, S. Srivastav, T. de Boer, T. Moore, V. A. Villar, W. B. Hoogendam","submitted_at":"2024-09-03T18:00:01Z","abstract_excerpt":"We present multi-wavelength data of SN2020acct, a double-peaked stripped-envelope supernova (SN) in NGC2981 at ~150 Mpc. The two peaks are temporally distinct, with maxima separated by 58 rest-frame days, and a factor of 20 reduction in flux between. The first is luminous (M$_{r}$ = -18.00 $\\pm$ 0.02 mag), blue (g - r = 0.27 $\\pm$ 0.03 mag), and displays spectroscopic signatures of interaction with hydrogen-free circumstellar material. The second peak is fainter (M$_{r}$ = -17.29 $\\pm$ 0.03 mag), and spectroscopically similar to an evolved stripped-envelope SNe, with strong blended forbidden ["},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2409.02174","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/2409.02174/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"}