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How much H and He is 'hidden' in SNe Ib/c? - II. Intermediate-mass objects: A 22M<inf>⊙</inf>progenitor case study

Teffs, J, Ertl, T, Mazzali, P, Hachinger, S and Janka, HT (2020) How much H and He is 'hidden' in SNe Ib/c? - II. Intermediate-mass objects: A 22M<inf>⊙</inf>progenitor case study. Monthly Notices of the Royal Astronomical Society, 499 (1). pp. 730-747. ISSN 0035-8711

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Stripped envelope supernovae are a sub-class of core-collapse supernovae showing several stages of H/He shell stripping that determines the type: H-free/He-poor SNe are classified as Type Ic, H-poor/He-rich are Type Ib, and H/He-rich are Type IIb. Stripping H/He with only stellar wind requires significantly higher mass-loss rates than observed while binary-involved mass transfer may usually not strip enough to produce H/He free SNe. Type Ib/c SNe are sometimes found to include weak H/He transient lines as a product of a trace amount of H/He left over from stripping processes. The extent and mass of the H/He required to produce these lines is not well known. In this work, a 22 M⊙progenitor model is stripped of the H/He shells in five steps prior to collapse and then exploded at four explosion energies. Requiring both optical and near-infrared He I lines for helium identification does not allow much He mass to be hidden in SE-SNE. Increasing the mass of He above the CO core delays the visibility of OI 7774 in early spectra. Our SN Ib-like models are capable of reproducing the spectral evolution of a set of observed SNe with reasonable estimated Ek accuracy. Our SNIIb-like models can partially reproduce low energy observed SN IIb, but we find no observed comparison for the SN IIb-like models with high Ek.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: Astronomy & Astrophysics; 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 09 Nov 2022 11:02
Last Modified: 09 Nov 2022 11:02
DOI or ID number: 10.1093/mnras/staa2549
URI: https://researchonline.ljmu.ac.uk/id/eprint/18077
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