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Flash Ionization Signatures in the Type Ibn Supernova SN 2019uo

Gangopadhyay, A and Misra, K and Hiramatsu, D and Wang, SQ and Hosseinzadeh, G and Wang, X and Valenti, S and Zhang, J and Howell, DA and Arcavi, I and Anupama, GC and Burke, J and Dastidar, R and Itagaki, K and Kumar, B and Kumar, B and Li, L and McCully, C and Mo, J and Pandey, SB and Pellegrino, C and Sai, H and Sahu, DK and Sanwal, P and Singh, A and Singh, M and Zhang, J and Zhang, T and Zhang, X (2020) Flash Ionization Signatures in the Type Ibn Supernova SN 2019uo. In: Astrophysical Journal, 889 (2).

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Official URL: https://dx.doi.org/10.3847/1538-4357/ab6328


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 day-1 similar to most of the SNe Ibn, but is fainter (M&max-V=-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 evolve and become 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 well described by a 56Ni + circumstellar interaction model.

Item Type: Journal Article
Publication: Astrophysical Journal
Publisher: Institute of Physics Publishing
Additional Information: The copyright of this article belongs to Institute of Physics Publishing
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Jun 2020 09:59
Last Modified: 26 Jun 2020 09:59
URI: http://eprints.iisc.ac.in/id/eprint/64879

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