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Flash ionization signatures in the type Ibn supernova SN 2019uo

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arxiv 1912.07878 v1 pith:TVWHXFPB submitted 2019-12-17 astro-ph.HE

Anjasha Gangopadhyay , Kuntal Misra , Daichi Hiramatsu , Shan-Qin Wang , Griffin Hosseinzadeh , Xiaofeng Wang , Stefano Valenti , Jujia Zhang
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D. Andrew Howell Iair Arcavi G.C. Anupama Jamison Burke Raya Dastidar Koichi Itagaki Brajesh Kumar Brijesh Kumar Long Li Curtis McCully Jun Mo Shashi Bhushan Pandey Craig Pellegrino Hanna Sai D.K. Sahu Pankaj Sanwal Avinash Singh Mridweeka Singh Jicheng Zhang Tianmeng Zhang Xinhan Zhang
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abstract

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 ($M^V_{max} = -18.30 \pm 0.24$ 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 $^{56}$Ni + circumstellar interaction model.

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  1. Wild behaviour near the finish line: the Type Ibn SN 2020able and its stratified environment

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    The Type Ibn supernova SN 2020able exploded inside a stratified, three-component helium-rich envelope, with an inner dense shell from a pre-explosion eruption and an outer shell consistent with a Wolf-Rayet wind.

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