We present photometric and spectroscopic observations of the type Ibn supernova (SN) 2019uo, the second ever SN Ibn with flash ionization (He II, C III, N III) features in its early spectra. SN 2019uo displays a rapid post-peak luminosity decline of 0.1 mag d−1 similar to most of the SNe Ibn, but is fainter (MmaxV=−18.30±0.24 mag) than a typical SN Ibn and shows a color evolution that places it between SNe Ib and the most extreme SNe Ibn. SN 2019uo shows P-cygni He I features in the early spectra which gradually evolves and becomes emission dominated post peak. It also shows faster evolution in line velocities as compared to most other members of the type Ibn subclass. The bolometric light curve is fairly described by a 56Ni + circumstellar interaction model.
@article{arxiv.1912.07878,
title = {Flash ionization signatures in the type Ibn supernova SN 2019uo},
author = {Anjasha Gangopadhyay and Kuntal Misra and Daichi Hiramatsu and Shan-Qin Wang and Griffin Hosseinzadeh and Xiaofeng Wang and Stefano Valenti and Jujia Zhang and D. Andrew Howell and Iair Arcavi and G. C. Anupama and Jamison Burke and Raya Dastidar and Koichi Itagaki and Brajesh Kumar and Brijesh Kumar and Long Li and Curtis McCully and Jun Mo and Shashi Bhushan Pandey and Craig Pellegrino and Hanna Sai and D. K. Sahu and Pankaj Sanwal and Avinash Singh and Mridweeka Singh and Jicheng Zhang and Tianmeng Zhang and Xinhan Zhang},
journal= {arXiv preprint arXiv:1912.07878},
year = {2020}
}
Comments
14 figures, 4 tables, Accepted for publication in ApJ, Corner plots are put in low resolution due to size limitations, please contact authors for original figure