{"paper":{"title":"SN 2021aaev: a Hydrogen-Rich Superluminous Supernova with Early Flash and Long-Lived Circumstellar Interaction in an Unusual Host Environment","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Alberto Saldana-Lopez, Anamaria Gkini, Anders Jerkstrand, Anjasha Gangopadhyay, Avinash Singh, Cosimo Inserra, David R. Young, Giuliano Pignata, Irene Salmaso, Jacob L. Wise, Jesper Sollerman, Joseph P. Anderson, Judy Adler, Lin Yan, Mansi M. Kasliwal, Mariusz Gromadzki, Matthew J. Hayes, Matt Nicholl, Priscila J. Pessi, Ragnhild Lunnan, Se\\'an J. Brennan, Stefano P. Cosentino, Steve Schulze, Thallis Pessi, Ting-Wan Chen, Tom\\'as E. M\\\"uller-Bravo, Tracy X. Chen, Yang Hu","submitted_at":"2025-08-15T16:05:45Z","abstract_excerpt":"We present photometric and spectroscopic observations of SN\\,2021aaev, a hydrogen-rich, superluminous supernova with persistent (at least $\\sim100$ days) narrow Balmer lines (SLSN-IIn) at redshift $z=0.1557$. We observed SN\\,2021aaev to rise in $32.5 \\pm 1.0$ days since first light and reach a peak absolute magnitude of $-21.46 \\pm 0.01$ in the ATLAS $o$ band. The pre-peak spectra resemble those of typical SNe IIn with flash-ionization features arising from the interaction with a dense, confined circumstellar medium (CSM), albeit the flash timescale is longer than usual ($>20$ days). Post peak"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.11559","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/2508.11559/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"}