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Optical and spectral observations and hydrodynamic modelling of type IIb supernova 2017gpn

Balakina, EA, Pruzhinskaya, MV, Moskvitin, AS, Blinnikov, SI, Wang, X, Xiang, D, Lin, H, Rui, L and Wang, H (2021) Optical and spectral observations and hydrodynamic modelling of type IIb supernova 2017gpn. Monthly Notices of the Royal Astronomical Society, 501 (4). pp. 5797-5810. ISSN 0035-8711

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In this work we present the photometric and spectroscopic observations of type IIb supernova 2017gpn. This supernova was discovered in the error-box of the LIGO/Virgo G299232 gravitational-wave event. We obtained the light curves in the B and R passbands and modelled them numerically using the one-dimensional radiation hydrocode STELLA. The best-fitting model has the following parameters: the pre-SN star mass and the radius are M ≈ 3.5 M⊙ and R ≈ 50 R⊙, respectively; the explosion energy is Eexp≈1.2×1051 erg; the mass of radioactive nickel is M56Ni≈0.11 M⊙, which is completely mixed throughout the ejecta; and the mass of the hydrogen envelope MH_env ≈ 0.06 M⊙. Moreover, SN 2017gpn is a confirmed SN IIb that is located at the farthest distance from the centre of its host galaxy NGC 1343 (i.e. the projected distance is ∼21 kpc). This challenges the scenario of the origin of type IIb supernovae from massive stars.

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: 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: 16 Feb 2023 10:44
Last Modified: 16 Feb 2023 10:44
DOI or ID number: 10.1093/mnras/staa3383
URI: https://researchonline.ljmu.ac.uk/id/eprint/18906
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