How much H and He is ‘hidden’ in SNe Ib/c? – II. Intermediate-mass objects: a 22 M⊙ progenitor case study

Autor: Paolo A. Mazzali, Stephan Hachinger, H.-Thomas Janka, T. Ertl, J. Teffs
Rok vydání: 2020
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 499:730-747
ISSN: 1365-2966
0035-8711
Popis: Stripped envelope supernovae are a sub-class of core collapse supernovae showing several stages of H/He shell stripping that determines the class: 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$_{\odot}$ 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 NIR 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 O I 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 $E_\mathrm{k}$ accuracy. Our SN\,IIb-like models can partially reproduce low energy observed SN IIb, but we find no observed comparison for the SN IIb-like models with high $E_\mathrm{k}$.
Comment: 19 pages, 15 figures. Accepted by MNRAS, awaiting publication
Databáze: OpenAIRE