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Observations and spectral modelling of the narrow-lined Type Ic SN 2017ein

Teffs, JJ, Prentice, SJ, Mazzali, PA and Ashall, C (2021) Observations and spectral modelling of the narrow-lined Type Ic SN 2017ein. Monthly Notices of the Royal Astronomical Society, 502 (3). pp. 3829-3842. ISSN 0035-8711

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SN 2017ein is a narrow-lined Type Ic SN that was found to share a location with a point-like source in the face on spiral galaxy NGC 3938 in pre-supernova images, making SN 2017ein the first credible detection of a Type Ic progenitor. Results in the literature suggest that this point-like source is likely a massive progenitor of 60-80 M·, depending on if the source is a binary, a single star, or a compact cluster. Using new photometric and spectral data collected for 200 d, including several nebular spectra, we generate a consistent model covering the photospheric and nebular phase using a Monte Carlo radiation transport code. Photospheric phase modelling finds an ejected mass 1.2-2.0 M· with an Ek of ∼(0.9 ± 0.2) × 1051 erg, with approximately 1 M· of material below 5000 km s-1 found from the nebular spectra. Both photospheric and nebular phase modelling suggests a 56Ni mass of 0.08-0.1 M·. Modelling the [O i] emission feature in the nebular spectra suggests that the innermost ejecta are asymmetric. The modelling results favour a low-mass progenitor of 16-20 M·, which is in disagreement with the pre-supernova derived high-mass progenitor. This contradiction is likely due to the pre-supernova source not representing the actual progenitor.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: Science & Technology; Physical Sciences; Astronomy & Astrophysics; radiative transfer; supernovae: general; supernovae: individual: SN2017ein; DIGITAL SKY SURVEY; HELIUM STARS; LIGHT CURVES; IB/C SUPERNOVAE; EVOLUTION; EXPLOSION; PROGENITOR; EMISSION; 2007GR; EJECTA; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
SWORD Depositor: A Symplectic
Date Deposited: 04 Nov 2022 10:40
Last Modified: 04 Nov 2022 10:45
DOI or ID number: 10.1093/mnras/stab258
URI: https://researchonline.ljmu.ac.uk/id/eprint/18013
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