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Fig. 1.

image

Left: unmixed chemical composition versus Lagrangian mass in the s15A ejecta model of Woosley & Heger (2007) at 345 d (the original mass fraction is shown for 56Ni), arising from a 15 M progenitor star on the main sequence, and having an ejecta kinetic energy of 1.2 × 1051 erg, a total ejecta mass of 10.96 M, and 0.083 M of 56Ni initially. To properly identify the eight shells, we also show the profiles for C, N, Mg, and Ca. Right: composition profile obtained with the new mixing approach presented in this Letter, using Msh = 5.36 M, in which only macroscopic mixing was applied by splitting and shuffling ejecta shells identified in the unmixed model shown on the left. In both panels (and in Fig. 2), the origin of the x-axis is at 1.83 M, which corresponds to the mass of the compact remnant.

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