Table 2.
Time-integrated merger rate of NS–WD binaries per 105 M⊙ of created stars for the different BPS models (Sect. 2).
| BPS Model |  |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Type | CE | SN-kick | Total | CO WD (%) | ONe WD (%) | He WD (%) | Direct WDNS | Direct NSWD | Semi-rev WDNS | Rev NSWD |
| Main models | ||||||||||
| αα | Hobbs | 4.7 | 80 | 20 | 0.4 | 2.7 | 0.76 | 0.77 | 0.53 | |
| αα | Arzoumanian | 5.6 | 84 | 15 | 1.4 | 2.2 | 2.1 | 0.75 | 0.44 | |
| αα | Verbunt | 7.4 | 84 | 15 | 1.4 | 2.9 | 2.9 | 0.93 | 0.57 | |
| αα | Blaauw | 18 | 89 | 9 | 2 | 3.3 | 12.7 | 1.2 | 0.72 | |
| αα2 | Hobbs | 4.0 | 63 | 37 | − | 3.2 | 0.01 | 0.65 | 0.15 | |
| αα2 | Arzoumanian | 3.8 | 61 | 39 | 0.07 | 2.9 | 0.10 | 0.58 | 0.15 | |
| αα2 | Verbunt | 4.7 | 62 | 38 | 0.09 | 3.8 | 0.14 | 0.67 | 0.16 | |
| αα2 | Blaauw | 8.1 | 66 | 33 | 0.4 | 5.1 | 2.0 | 0.74 | 0.25 | |
| γα | Hobbs | 3.7 | 77 | 22 | 0.7 | 2.8 | 0.56 | 0.24 | 0.09 | |
| γα | Arzoumanian | 4.0 | 83 | 16 | 1.3 | 2.3 | 1.5 | 0.20 | 0.03 | |
| γα | Verbunt | 5.4 | 82 | 16 | 1.4 | 3.0 | 2.1 | 0.29 | 0.06 | |
| γα | Blaauw | 12 | 90 | 7 | 2 | 3.3 | 8.1 | 0.30 | − | |
| Additional models | ||||||||||
| Isotropic re-emission | αα | Hobbs | 5.7 | 81 | 19 | 0.5 | 3.0 | 0.49 | 1.0 | 1.2 |
| αα2 | Hobbs | 4.4 | 64 | 36 | − | 3.4 | 0.02 | 0.90 | 0.14 | |
| Mass transfer stability | αα | Hobbs | 5.6 | 81 | 19 | 0.6 | 2.8 | 0.66 | 0.92 | 1.2 |
| αα2 | Hobbs | 4.2 | 63 | 37 | − | 3.2 | 0.01 | 0.92 | 0.13 | |
| Conservative mass transfer | αα | Hobbs | 4.8 | 80 | 20 | 0.6 | 2.8 | 0.77 | 0.80 | 0.45 |
| αα2 | Hobbs | 4.8 | 62 | 38 | − | 4.0 | 0.002 | 0.67 | 0.16 | |
| 50% conservative mass transfer | αα | Hobbs | 3.2 | 43 | 57 | − | 2.5 | 0.73 | − | − |
| αα2 | Hobbs | 0.26 | 42 | 58 | − | 0.24 | 0.02 | − | − | |
Notes. The main models vary with respect to the SN kick (drawn from the distribution of Hobbs et al. 2005, the distribution of Arzoumanian et al. 2002, or only the mass-loss kick, see e.g. Blaauw 1961) and the common-envelope phase (model αα, αα2, or γα). In the additional models several assumptions are varied in regards to the stable mass-transfer process. Columns 5–7 give the fraction of mergers with CO, ONe or He WDs, respectively. Columns 8–11 give the time-integrated merger rates from the four most common evolutionary channels described in Sect. 3.1.
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