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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). 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