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Table 1
Summary of the key parameters adopted in our standard simulations and the variations that we consider.
| Symbol | Standard modelsa | Model variations | ||
|
|
||||
| Physical assumptions | ||||
| - | Mass transfer efficiency | β |
|
0, 0.2, 1 |
| - | Angular momentum loss | γ | γorb,acc | 0, γdisk |
| - | Mass loss during merger of two MS stars | μloss | 0.1 | 0, 0.25 |
| - | Mixing during merger of two MS stars | μmix | 0.1 | 0, 1 |
| - | Natal kick compact remnant (km s-1) | σ | 265 | σ0, ∞ |
| - | Common envelope efficiency | αCE | 1 | 0.1, 0.2, 0.5, 2, 5, 10 |
| - | Envelope binding energy | λCE | λDewi + 00 | 0.5 |
| - | Critical mass ratio for contact for MS donor | qcrit,MS | 0.65 | 0.25, 0.8 |
| - | Critical mass ratio for unstable mass transfer for HG donor | qcrit,HG | 0.4 | 0, 0.25, 0.8, 1 |
| - | Stellar-wind mass-loss efficiency parameter | η | 1 | 0.33, 3 |
| - | Maximum single-star equivalent birth mass for ccSN (M⊙) | M max,cc | 100 | 20, 35 |
| - | Minimum metal core for ccSN (M⊙) | M min,metal | 1.37 | 1.3, 1.4 |
| Initial conditions | ||||
| - | Slope initial mass function | α | −2.3 | –1.6, –2.7, –3.0 |
| - | Slope initial mass ratio distribution | κ | 0 | –1, 1 |
| - | Slope of initial period distr. | π | π Opik24, Sana + 12 | –1, 1 |
| - | Metallicity | Z | 0.014 | 0.0002, 0.004, 0.008, 0.02, 0.03 |
| - | Binary fractiona | f bin | 0.7, 0.0a | 0.3, 1,  |
| - | Normalization parameter (M⊙) | Mlow | 2 | 1, 3 |
Notes. See Sect. 2 for a description of the symbols and further assumptions.
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