Final Moments III: Explosion Properties and Progenitor Constraints of CSM-Interacting Type II Supernovae
W. V. Jacobson-Gal’an, L. Dessart, K. W. Davis, K. A. Bostroem, C. D. Kilpatrick, R. Margutti, A. V. Filippenko, R. J. Foley, R. Chornock, G. Terreran, D. Hiramatsu, M. Newsome, E. Padilla Gonzalez, C. Pellegrino, D. A. Howell, J. P. Anderson, C. R. Angus, K. Auchettl, T. G. Brink, R. Cartier, D. A. Coulter, T. de Boer, M. R. Drout, N. Earl, K. Ertini, J. R. Farah, D. Farias, C. Gall, H. Gao, M. A. Gerlach, F. Guo, A. Haynie, G. Hosseinzadeh, A. L. Ibik, S. W. Jha, D. O. Jones, D. Langeroodi, N LeBaron, E. A. Magnier, A. L. Piro, S. I. Raimundo, A. Rest, S. Rest, R. Michael Rich, C. Rojas-Bravo, H. Sears, K. Taggart, V. A. Villar, R. J. Wainscoat, X-F. Wang, A. R. Wasserman, S. Yan, Y. Yang, J. Zhang, W. Zheng
arXiv:2505.04698v1 Announce Type: new
Abstract: We present analysis of the plateau and late-time phase properties of a sample of 39 Type II supernovae (SNe II) that show narrow, transient, high-ionization emission lines (i.e., “IIn-like”) in their early-time spectra from interaction with confined, dense circumstellar material (CSM). Originally presented by Jacobson-Gal’an et al 2024a, this sample also includes multicolor light curves and spectra extending to late-time phases of 35 SNe with no evidence for IIn-like features at 10^{16}$ cm, consistent with substantial progenitor mass-loss rates of $sim 10^{-4}$–$10^{-5}$ M$_{odot}$ yr$^{-1}$ ($v_w arXiv:2505.04698v1 Announce Type: new
Abstract: We present analysis of the plateau and late-time phase properties of a sample of 39 Type II supernovae (SNe II) that show narrow, transient, high-ionization emission lines (i.e., “IIn-like”) in their early-time spectra from interaction with confined, dense circumstellar material (CSM). Originally presented by Jacobson-Gal’an et al 2024a, this sample also includes multicolor light curves and spectra extending to late-time phases of 35 SNe with no evidence for IIn-like features at 10^{16}$ cm, consistent with substantial progenitor mass-loss rates of $sim 10^{-4}$–$10^{-5}$ M$_{odot}$ yr$^{-1}$ ($v_w