Table C.1.
Dominant formation scenarios of the merging DCOs in Model 1 and Model 2. The formation of NS-NS from LMXBs applies to Model 1 only.
DCO type | Forming scenario | XRB progenitor type |
---|---|---|
BH-BH | MT1(2-1) BH1 CE2(14-4;14-7) BH2 | HMXB |
BH-NS | MT1(2/9-1) BH1 CE2(14-4;14-7) MT2(14-8) NS2 | IMXB |
NS-NS | MT1(2/3/9-1) NS1 CE2(13-5;13-8) MT2(13-8/9) NS2 | HMXB |
NS-NS | MT(2/8/9-1) NS1 CE2(13-4;13-7) MT2(13-8/9) NS2 | LMXB |
Notes. MT1-stable RLOF, donor is initially a more massive star; MT2-stable RLOF, donor is initially a less massive star; BH1-formation of a BH by an initially more massive star; BH2-formation of a BH by an initially less massive star; NS1-formation of a NS by an initially more massive star; NS2-formation of a NS by an initially less massive star; CE2-common envelope initiated by an initially less massive star; The number following either “CE” or “MT” marks the donor star, “1” stands for an initially more massive star, and “2” stands for an initially less massive star. The first value in the brackets is the type of an initially more massive component and the second value is the type of an initially less massive component. The values after the slashes, e.g., 2/9, refer to the different possible evolutionary types of binary components during a given phase. In the case of the CE phase, the colon divides the component types at the onset (before the colon) from the component types after the envelope ejection (after the colon). The numeric types are consistent with Hurley et al. (2002): 1 - main sequence star with M > 0.7 M⊙ 2 - Hertzsprung gap star 3 - first giant branch star 4 - core helium burning star 5 - early asymptotic giant branch star 7 - main sequence naked helium star 8 - Hertzsprung gap naked helium star 9 - giant branch naked helium star 13 - NS 14 - BH
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