{"paper":{"title":"SN 2019vxm: A luminous and long-lived Type IIn supernova with early flash-ionisation features","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"A. deGraw, A. Morales-Garoffolo, A. Pastorello, A. Reguitti, A. Siviero, A. V. Filippenko, C. Jennings, D.-F. Xiang, E. Baron, G. Valerin, H.-Y. Wu, I. Altunin, I. Salmaso, J. Isern, J.-J. Zhang, J. M. DerKacy, J.-W. Zhao, K. \\v{C}otar, L.-P. Li, L. Tartaglia, L. Tomasella, M. Chu, M. May, M. Turatto, N. Elias-Rosa, P. A. Mazzali, P. Marziani, P. Ochner, R. Baer-Way, R. Kotak, S. Benetti, S. Moran, S.-Y. Yan, T. G. Brink, T. J. Moriya, V. Chander, W. Zheng, X.-F. Wang, Y.-Z. Cai, Z.-H. Peng, Z.-Y. Wang","submitted_at":"2026-06-29T14:44:14Z","abstract_excerpt":"We present the photometric and spectroscopic analysis of the luminous and long-lasting Type IIn supernova (SN) 2019vxm. The SN reaches a peak V-band absolute magnitude of MV = -20.01 +/- 0.13 mag in 35.0 days, and displays slow evolution in both the light curves and spectra, resembling that of long-lived SNe IIn. A mid-infrared (MIR) excess is detected starting from seven months after maximum brightness, suggesting a few 10^-3 solar masses of dust are newly formed at >= 210 days (and up to 0.01 solar masses at +4.5 yr). The spectra are dominated by a blue continuum at early stages, with narrow"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.30390","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/2606.30390/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"}