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Table 3.
Summary of possible model end state characteristics.
| He-detonation (HeDet) | He-deflagration (HeDef) | DD after Case BA MT (DD I) | DD after Case BAB MT (DD II) | DD without MT (DD III) | |
|---|---|---|---|---|---|
| Internal condition | Unstable He ignition with ρign> 106 g cm−3 | Unstable He ignition with ρign< 106 g cm−3 | Helium burning extinguished in donor before core helium exhausted | Helium burning extinguished in donor after core helium exhausted | No RLOF |
| Evolutionary condition | Case BA RLOF and Ṁ ≤ 3 × 10−8 M⊙ yr−1 | BABDef or Case BB RLOF with Ṁ ≥ 3 × 10−8 M⊙ yr−1 | Case BA RLOF with Ṁ ≤ 3 × 10−8 M⊙ yr−1 and low Md,i | Case BB RLOF during expansion gap | No RLOF |
| Resulting state of donor star | Core helium burning | HeDef with MHe≈ 0.1 M⊙: Core helium burning. HeDef with MHe < 0.1 M⊙: Helium shell burning | No He burning | CO WD with MHe < 0.1 M⊙ | CO WD with MHe < 0.1 M⊙ |
| Resulting state of accretor | Critical rotation. CO core with MHe > 0.1 M⊙. He detonation | Subcritical rotation. CO core with MHe< 0.1 M⊙. Subsonic He-ignition | High to critical rotation. CO core with MHe > 0.1 M⊙ | High rotation. CO core with MHe < 0.1 M⊙ | Unchanged |
| Expected Outcome | DDet | Strong flash. Possibly Chandrasekhar mass, depending on mass retention efficiency | Merger or DD RLOF | Merger or DD RLOF | Merger or DD RLOF |
| Decisive initial parameters | MWD, i ≥ 0.82 M⊙, low Pinit < 0.06 d, 0.95 M⊙ > Md,i > 0.55 M⊙ | Md, i ≥ 0.85 M⊙, Pinit ≥ 0.04 d | Md, i ≤ 0.7 M⊙ | Md, i ≤ 0.7 M⊙. RLOF during expansion gap | 0.5 M⊙ ≤ Md, i ≤ 0.6 M |
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