Table 4
Massive star – neutron star binary progenitor of GRB 110709B.
| Mprog/M⊙ | Mej(0)/M⊙ | ρej(0) (g cm-3) | ηaccr | ΔMaccr/Mej(0) | P (min) | vorb,NS(0) (km s-1) | Δtaccr/P | a/R⊙ |
|
|
||||||||
| 4 | 2.7 | 2.39 × 105 | 0.92 | 0.47 | 0.52 | 5.24 × 103 | 11.14 | 0.037 |
| 5 | 3.7 | 3.27 × 105 | 0.88 | 0.34 | 0.45 | 5.84 × 103 | 12.96 | 0.036 |
| 6 | 4.7 | 4.16 × 105 | 0.88 | 0.27 | 0.39 | 6.39 × 103 | 14.71 | 0.035 |
| 7 | 5.7 | 5.04 × 105 | 0.89 | 0.22 | 0.35 | 6.91 × 103 | 16.39 | 0.034 |
| 8 | 6.7 | 5.93 × 105 | 0.91 | 0.19 | 0.32 | 7.40 × 103 | 18.00 | 0.033 |
| 9 | 7.7 | 6.81 × 105 | 0.94 | 0.16 | 0.30 | 7.87 × 103 | 19.55 | 0.032 |
| 10 | 8.7 | 7.69 × 105 | 0.96 | 0.15 | 0.27 | 8.32 × 103 | 21.04 | 0.031 |
Notes. Mprog is the mass of the massive star (in solar masses), Mej(0) is the mass of the ejected material in the early SN phase (in solar masses), ρej(0) is the density of the ejecta at the beginning of the expansion, ηaccr is the efficiency of the accretion process onto the NS, ΔMaccr = Mcrit − MNS(0) is the total mass accreted by the NS before the collapse, P = 2πa/vorb,NS is the period of the binary, vorb,NS(0) is the initial orbital velocity of the NS and Δtaccr/P is the arc-length traveled by the NS during the accretion process in units of the length of the whole orbit and a/R⊙ is the binary separation (in units of solar radii). We assume that the accretion process starts 5 s before the first trigger time, i.e. t0,accr coincides with the time corresponding to the first datapoint in Fig. 5.
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