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Exploring the range of impacts of helium in the spectra of double detonation models for Type Ia supernovae

Models of sub-Chandrasekhar mass double detonations for Type Ia supernovae (SNe Ia) suggest a distinguishing property of this scenario is unburnt helium in the outer ejecta. However, modern explosion simulations suggest there may be significant variations in its mass and velocity distribution. We re...

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Main Authors: Callan, Fionntan P. (Author) , Collins, C E (Author) , Sim, S A (Author) , Shingles, L J (Author) , Pakmor, R (Author) , Srivastav, S (Author) , Pollin, J M (Author) , Gronow, S (Author) , Röpke, Friedrich (Author) , Seitenzahl, I R (Author)
Format: Article (Journal)
Language:English
Published: May 2025
In: Monthly notices of the Royal Astronomical Society
Year: 2025, Volume: 539, Issue: 2, Pages: 1404-1413
ISSN:1365-2966
DOI:10.1093/mnras/staf539
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnras/staf539
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Author Notes:F.P. Callan, C.E. Collins, S.A. Sim, L.J. Shingles, R. Pakmor, S. Srivastav, J.M. Pollin, S. Gronow, F.K. Röpke and I.R. Seitenzahl
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Summary:Models of sub-Chandrasekhar mass double detonations for Type Ia supernovae (SNe Ia) suggest a distinguishing property of this scenario is unburnt helium in the outer ejecta. However, modern explosion simulations suggest there may be significant variations in its mass and velocity distribution. We recently presented a NLTE (non local thermodynamic equilibrium) radiative transfer simulation for one realization of the double detonation scenario with a modest He mass (0.018 $\mathrm{M}_\odot$) present in the ejecta at relatively high velocities (${\sim }18\,000\, \mathrm{km}\, \mathrm{s}^{-1}$). That simulation predicted a He i 10 830 Å feature blueward of Mg ii 10 927 Å consistent with near-infrared observations of ‘transitional’ SNe Ia. To demonstrate the expected diversity in the helium signature, here we present a calculation for a double detonation model with a higher He mass (${\sim }$0.04 $\mathrm{M}_\odot$) ejected at lower velocities (${\sim }13\,000\, \mathrm{km}\, \mathrm{s}^{-1}$). Despite our simulation predicting no clear optical or 2 $\m
Item Description:Veröffentlicht: 03. April 2025
Gesehen am 02.10.2025
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/staf539

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