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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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Bibliographic Details
Main Authors: Collins, Christine E. (Author) , Sim, Stuart (Author) , Shingles, Luke J. (Author) , Gronow, Sabrina (Author) , Röpke, Friedrich (Author) , Pakmor, Rüdiger (Author) , Seitenzahl, Ivo R. (Author) , Kromer, Markus (Author)
Format: Article (Journal)
Language:English
Published: September 2023
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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Summary: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. ...
Item Description:Online veröffentlicht am 19. Juli 2023
Gesehen am 12.12.2023
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stad2170

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