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8 Publications visible to you, out of a total of 8
Helium as a signature of the double detonation in Type Ia supernovae

Abstract

Not specified

Authors: Christine E. Collins, Stuart A. Sim, Luke J. Shingles, Sabrina Gronow, Friedrich K. Röpke, Rüdiger Pakmor, Ivo R. Seitenzahl, Markus Kromer

Date Published: 1st Sep 2023

Publication Type: Journal

Modeling Type Ia supernovae with explosions in white dwarfs near and below the Chandrasekhar mass

Abstract (Expand)

The progenitor evolution and the explosion mechanism of Type Ia supernovae remain unexplained. Nonetheless, substantial progress has been made over the past years with three-dimensional hydrodynamic …c simulations of different scenarios. Here, we review some recent work pertaining to the leading paradigms of modeling: thermonuclear explosions of white dwarf stars near and below the Chandrasekhar mass limit. We discuss implications of the different explosion channels and their predictions of observables.

Authors: Friedrich K. Röpke, Florian Lach, Sabrina Gronow, Stuart A. Sim, Fionntan P. Callan, Christine E. Collins

Date Published: 1st Feb 2023

Publication Type: Journal

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

Abstract

Not specified

Authors: Christine E. Collins, Sabrina Gronow, Stuart A. Sim, Friedrich K. Röpke

Date Published: 1st Dec 2022

Publication Type: Journal

Metallicity-dependent nucleosynthetic yields of Type Ia supernovae originating from double detonations of sub- M Ch white dwarfs

Abstract

Not specified

Authors: Sabrina Gronow, Benoit Côté, Florian Lach, Ivo R. Seitenzahl, Christine E. Collins, Stuart A. Sim, Friedrich K. Röpke

Date Published: 1st Dec 2021

Publication Type: Journal

Double detonations of sub-M Ch CO white dwarfs: variations in Type Ia supernovae due to different core and He shell masses

Abstract

Not specified

Authors: Sabrina Gronow, Christine E. Collins, Stuart A. Sim, Friedrich K. Röpke

Date Published: 1st May 2021

Publication Type: Journal

Nucleosynthesis imprints from different Type Ia supernova explosion scenarios and implications for galactic chemical evolution

Abstract

Not specified

Authors: F. Lach, F. K. Röpke, I. R. Seitenzahl, B. Coté, S. Gronow, A. J. Ruiter

Date Published: 1st Dec 2020

Publication Type: Journal

SNe Ia from double detonations: Impact of core-shell mixing on the carbon ignition mechanism

Abstract (Expand)

Sub-Chandrasekhar mass white dwarfs accreting a helium shell on a carbon-oxygen core are potential progenitors of normal Type Ia supernovae. This work focuses on the details of the onset of the carbon … detonation in the double detonation sub-Chandrasekhar model. In order to simulate the influence of core-shell mixing on the carbon ignition mechanism, the helium shell and its detonation are followed with an increased resolution compared to the rest of the star treating the propagation of the detonation wave more accurately. This significantly improves the predictions of the nucleosynthetic yields from the helium burning. The simulations were carried out with the AREPO code. A carbon-oxygen core with a helium shell was set up in one dimension and mapped to three dimensions. We ensured the stability of the white dwarf with a relaxation step before the hydrodynamic detonation simulation started. Synthetic observables were calculated with the radiative transfer code ARTIS. An ignition mechanism of the carbon detonation was observed, which received little attention before. In this "scissors mechanism", the impact the helium detonation wave has on unburnt material when converging opposite to its ignition spot is strong enough to ignite a carbon detonation. This is possible in a carbon enriched transition region between the core and shell. The detonation mechanism is found to be sensitive to details of the core-shell transition and our models illustrate the need to consider core-shell mixing taking place during the accretion process. Even though the detonation ignition mechanism differs form the converging shock mechanism, the differences in the synthetic observables are not significant. Though they do not fit observations better than previous simulations, they illustrate the need for multi-dimensional simulations.

Authors: Sabrina Gronow, Christine Collins, Sebastian T. Ohlmann, Rüdiger Pakmor, Markus Kromer, Ivo R. Seitenzahl, Stuart A. Sim, Friedrich K. Röpke

Date Published: 1st Mar 2020

Publication Type: Journal

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