{"paper":{"title":"The transitional Type Ibn/IIn SN 2022pda, with pre-explosion outbursts and a double-peaked light curve","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Pastorello, A. Reguitti, B. Wang, C.-C. Lin, C. Inserra, C. McCully, C. Pellegrino, D. A. Howell, D. R. Young, E. A. Magnier, E. Cappellaro, E. Kankare, E. Padilla Gonzalez, G. Hosseinzadeh, G. Pignata, G. Terreran, G. Valerin, H. Gao, I. A. Smith, I. Salmaso, J. Duarte, J.-J. Zhang, J.-M. Bai, J. P. Anderson, J. Sollerman, J.-W. Zhao, K. C. Chambers, K. Matilainen, K. W. Smith, L. Galbany, L.-P. Li, L. Tartaglia, M. D. Stritzinger, M. Fraser, M. Gromadzki, M. Newsome, N. Elias-Rosa, P. A. Mazzali, P. J. Pessi, P. Lundqvist, P. Minguez, R. Chiba, R. P. Santos, R. Wainscoat, S. Benetti, S. Campana, S. J. Brennan, S. J. Smartt, S. Moran, S.-Q. Wang, S. Schulze, S. Srivastav, S. Zha, T. B. Lowe, T. de Boer, T. E. M\\\"uller-Bravo, T. J. Moriya, T. Kangas, T. Kravtsov, T. Petrushevska, T.-W. Chen, W.-P. Gan, X.-F. Wang, Y.-Z. Cai, Y.-Z. Dong, Z.-H. Chen, Z. Li, Z.-Y. Wang","submitted_at":"2026-05-25T13:19:41Z","abstract_excerpt":"We report the results of a photometric and spectroscopic follow-up campaign of the unusual interacting supernova (SN) 2022pda. Precursor variability lasting $\\sim 100$ days is observed before the explosion. The SN light curve has a double peak shape. It reached a first maximum of $M_{\\rm{r}} = -19.6 \\pm 0.2$\\,mag, followed by an initial two-month decline and a second, broad peak lasting about six months. The early spectra show a blue continuum with dominant H and He emission lines. A high-resolution pre-maximum spectrum shows that the profile of the \\Hei~$\\lambda$5876 line consists of a modera"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.25823","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/2605.25823/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"}