Table 2
Masses of ejecta elements (total, shocked, and unshocked) in the W15-IIb-sh-HD+dec-hr model at 351 years.
| W15-IIb-sh-HD+dec-hr | (a) | (b) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Total mass | Shocked mass | Unshocked mass | Msh/ | Shocked mass | Unshocked mass | |||||
| Mtot/M⊙ | % | Msh/M⊙ | % | Mush/M⊙ | % | Mush | Msh/M⊙ | Mush/M⊙ | % | |
| ejecta | 3.3 | – | 2.5 | – | 0.79 | – | 3.2 | – |  |
– |
| He | 1.98 | 58 | 1.87 | 72 | 0.11 | 14 | 17 | – | – | – |
| C | 0.17 | 5.0 | 0.10 | 3.9 | 0.068 | 8.6 | 1.5 | – | – | – |
| O | 0.59 | 17 | 0.25 | 9.6 | 0.34 | 43 | 0.73 | [1.80, 2.55] | 0.14 ± 0.02 | 30 |
| Ne | 0.14 | 4.1 | 0.068 | 2.6 | 0.072 | 9.1 | 0.94 | [0.027, 0.038] | 0.0023 ± 0.0016 | 0.26 |
| Mg | 0.038 | 1.1 | 0.015 | 0.57 | 0.023 | 2.9 | 0.65 | [0.007, 0.01] | – | – |
| Si | 0.027 | 0.79 | 0.010 | 0.38 | 0.017 | 2.2 | 0.59 | [0.038, 0.054] | 0.31 ± 0.05 | 60 |
| Ca | 0.054 | 1.6 | 0.012 | 0.46 | 0.042 | 5.4 | 0.29 | – | – | – |
| Ti(c) | 0.0028 | 0.082 | 0.0070 | 0.027 | 0.0021 | 0.26 | 0.33 | – | – | – |
| Fe | 0.093 | 2.7 | 0.029 | 1.1 | 0.064 | 8.1 | 0.45 | [0.098, 0.14](d) | <0.07 | <15 |
| X(e) | 0.041 | 1.2 | 0.014 | 0.54 | 0.027 | 3.4 | 0.52 | – | – | – |
Notes. The table also includes the ratio of shocked to unshocked masses. The last three columns provide, for comparison, the shocked mass values inferred from Chandra data analysis of Cas A (Hwang & Laming 2012) and the unshocked mass values inferred from Spitzer data analysis (Laming & Temim 2020). (a) Data from Hwang & Laming (2012); each element is presented with two values, corresponding to assumed filling factors based on density spike thickness of 2.5′′ and 5′′. (b)Data from Laming & Temim (2020). (c) The ejecta mass of 44Ti is overestimated by a factor 10–20 due to a reduced network in the original SN model, which included only 9 of 13 α nuclei up to 56Ni (see Wongwathanarat et al. 2017). (d)The values reported consider the total Fe masses from incomplete Si burning (FeSi) plus from complete Si burning and/or α-rich freezout (Feα) (Hwang & Laming 2012). (e)The tracer nucleus 56X represents Fe-group species synthesized in neutron-rich environments as, for instance, in neutrino-heated ejecta (see Wongwathanarat et al. 2017). The table lists the mass of 56Fe, calculated as MFe + 0.5 MX, and the mass of 56X, estimated as 0.5 MX.
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