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The Spectral Reclassification of Nearby (z < 0.02) Type IIn Supernovae

Ransome, CL, Habergham-Mawson, SM, Darnley, MJ, James, PA, Filippenko, AV and Schlegel, EM (2021) The Spectral Reclassification of Nearby (z < 0.02) Type IIn Supernovae. Research Notes of the American Astronomical Association RN AAS, 5 (5). ISSN 2515-5172

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Open Access URL: https://iopscience.iop.org/article/10.3847/2515-51... (Published version)

Abstract

Type IIn supernovae (SNe IIn) are an enigmatic subclass of SNe that show heterogeneity in their photometric and spectroscopic properties. Complex, multi-component Balmer line profiles are a defining property of SNe IIn. Perhaps owing to the heterogeneity in the SN IIn class, online databases often conflict and hold outdated or erroneous classifications. This is compounded by SN "impostors" and H ii region contamination. We outline a classification scheme based on multi-component Hα profiles and apply it to a sample of 115 nearby (redshift z < 0.02) SNe that have held a SN IIn classification on the Open Supernova Catalogue (OSC). We find that 25 of our transients were misclassified as SNe IIn. We also note that there is disagreement between OSC and the Transient Name Server for 51 of the transients.

Item Type: Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Date Deposited: 07 Jul 2021 10:16
Last Modified: 07 Jul 2021 10:16
DOI or Identification number: 10.3847/2515-5172/ac01cd
URI: https://researchonline.ljmu.ac.uk/id/eprint/15258

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