{"paper":{"title":"Massive stars exploding in a He-rich circumstellar medium $-$ X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Aryan, A. Gal-Yam, A. Gangopadhyay, A. Melandri, A. Pastorello, A. Rau, A. Reguitti, B. Wang, B. Warwick, C. Inserra, C. McCully, D. Andrew Howell, D. Buckley, D.-D Shi, D. Hiramatsu, D.R. Young, E. Cappellaro, E. Concepcion, F.E. Olivares, F. Ragosta, G. Pignata, G. Terreran, G. Valerin, H. Lin, J.-J. Zhang, J. Pineda-Garc'ia, J. Sollerman, K. Maeda, L. Galbany, L. Tartaglia, M. Bronikowski, M. Gromadzki, M.-K. Hu, M. Nicholl, M. Pursiainen, M. Ramirez, N. Elias-Rosa, Q.-L. Fang, Q. Wang, R. Carini, R. Cartier, R. Roy, S. Benetti, S.-Q. Wang, T. Petrushevska, T.-W. Chen, W.-P. Gan, X.-F. Wang, X.-J. Zhu, Y.-Z. Cai, Z.-Y. Wang","submitted_at":"2024-08-22T13:38:50Z","abstract_excerpt":"We present optical and near-infrared observations of two Type Ibn supernovae (SNe), SN 2018jmt and SN 2019cj. Their light curves have rise times of about 10 days, reaching an absolute peak magnitude of $M_g$(SN 2018jmt) = $-$19.07 $\\pm$ 0.37 and $M_V$(SN 2019cj) = $-$18.94 $\\pm$ 0.19 mag, respectively. The early-time spectra of SN 2018jmt are dominated by a blue continuum, accompanied by narrow (600$-$1000 km~s$^{-1}$) He I lines with P-Cygni profile. At later epochs, the spectra become more similar to those of the prototypical SN Ibn 2006jc. At early phases, the spectra of SN 2019cj show flas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.12393","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/2408.12393/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"}