Helium as a signature of the double detonation in Type Ia supernovae
The double detonation is a widely discussed mechanism to explain Type Ia supernovae from explosions of sub-Chandrasekhar mass white dwarfs. In this scenario, a helium detonation is ignited in a surface helium shell on a carbon/oxygen white dwarf, which leads to a secondary carbon detonation. Explosi...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
September 2023
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2023, Volume: 524, Issue: 3, Pages: 4447-4454 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stad2170 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stad2170 Verlag, lizenzpflichtig, Volltext: https://academic.oup.com/mnras/article/524/3/4447/7226708 
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| Author Notes: | Christine E Collins, Stuart A Sim, Luke J Shingles, Sabrina Gronow, Friedrich K Röpke, Rüdiger Pakmor, Ivo R Seitenzahl and Markus Kromer |
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| 520 | |a The double detonation is a widely discussed mechanism to explain Type Ia supernovae from explosions of sub-Chandrasekhar mass white dwarfs. In this scenario, a helium detonation is ignited in a surface helium shell on a carbon/oxygen white dwarf, which leads to a secondary carbon detonation. Explosion simulations predict high abundances of unburnt helium in the ejecta, however, radiative transfer simulations have not been able to fully address whether helium spectral features would form. This is because helium can not be sufficiently excited to form spectral features by thermal processes, but can be excited by collisions with non-thermal electrons, which most studies have neglected. We carry out a full non-local thermodynamic equilibrium radiative transfer simulation for an instance of a double detonation explosion model, and include a non-thermal treatment of fast electrons. ... | ||
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