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Double detonations: variations in Type Ia supernovae due to different core and He shell masses; II. Synthetic observables

Double detonations of sub-Chandrasekhar mass white dwarfs are a promising explosion scenario for Type Ia supernovae, whereby a detonation in a surface helium shell triggers a secondary detonation in a carbon-oxygen core. Recent work has shown that low-mass helium shell models reproduce observations...

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Bibliographic Details
Main Authors: Collins, Christine E. (Author) , Gronow, Sabrina (Author) , Sim, Stuart A (Author) , Röpke, Friedrich (Author)
Format: Article (Journal)
Language:English
Published: 2022 October 24
In: Monthly notices of the Royal Astronomical Society
Year: 2022, Volume: 517, Issue: 4, Pages: 5289-5302
ISSN:1365-2966
DOI:10.1093/mnras/stac2665
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stac2665
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Author Notes:Christine E. Collins, Sabrina Gronow, Stuart A. Sim and Friedrich K. Röpke
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Summary:Double detonations of sub-Chandrasekhar mass white dwarfs are a promising explosion scenario for Type Ia supernovae, whereby a detonation in a surface helium shell triggers a secondary detonation in a carbon-oxygen core. Recent work has shown that low-mass helium shell models reproduce observations of normal SNe Ia. We present 3D radiative transfer simulations for a suite of 3D simulations of the double detonation explosion scenario for a range of shell and core masses. We find light curves broadly able to reproduce the faint end of the width-luminosity relation shown by SNe Ia, however, we find that all of our models show extremely red colours, not observed in normal SNe Ia. This includes our lowest mass helium shell model. We find clear Ti ii absorption features in the model spectra, which would lead to classification as peculiar SNe Ia, as well as line blanketing in some lines of sight by singly ionized Cr and Fe-peak elements. Our radiative transfer simulations show that these explosion models remain promising to explain peculiar SNe Ia. Future full non-LTE simulations may improve the agreement of these explosion models with observations of normal SNe Ia.
Item Description:Gesehen am 20.01.2023
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stac2665

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