A Tracer Method For Type Ia Supernova Yields


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Contact: F.X.Timmes
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Burning Model Calibration, Reconstruction Of Thickened Flames, And Verification For Planar Detonations (2016)

In this paper by Townsley et al we refine our previously introduced parameterized model for explosive carbon-oxygen fusion during thermonuclear supernovae (SN~Ia) by adding corrections to post-processing of recorded Lagrangian fluid element histories to obtain more accurate isotopic yields.

A new method is introduced for reconstructing the temperature-density history within the artificially thick model deflagration front. We obtain better than 5% consistency between the electron capture computed by the burning model and yields from post-processing. For detonations, we compare to a benchmark calculation of the structure of driven steady-state planar detonations performed with a large nuclear reaction network and error-controlled integration. For steady-state planar detonations down to a density of 5 × 106 g cm-3 our post processing matches the major abundances in the benchmark solution typically to better than 10% for times greater than 0.01 s after the shock front passage.

Presented here with post-processing for the first time, we perform a 2D SN~Ia in the Chandrasekhar-mass deflagration-detonation transition (DDT) scenario. We find that reconstruction of deflagration tracks leads to slightly more complete silicon burning than without reconstruction. The resulting abundance structure of the ejecta is consistent with inferences from spectroscopic studies of observed SNe~Ia. We confirm the absence of a central region of stable Fe-group material for the multi-dimensional DDT scenario. Detailed isotopic yields are tabulated and only change modestly when using deflagration reconstruction.

C+O burning stages
thin, multistage reaction fronts
structure of detonation pressure
profiles with 1 σ deviations