Table 1.
Summary of the accretion-to-jet energy conversion efficiencies discussed in the text.
| GW170817 measured | η/10−3 | 68% C.I. |
|---|---|---|
| Any Mdisc | 1.2 | 0.2 – 8.2 |
| Mdisc > 0.04 M⊙ | 0.6 | 0.1 – 2.6 |
| Blandford-Znajek, fitting formulae (a) | ||
| McKinney (2005) | 0.8 | 0.5 – 1.7 |
| Hawley et al. (2007) | 6.8 | 5.8 – 7.0 |
| MAD (b) | 380 | 375 – 381 |
| Blandford-Znajek, BNS simulations | ||
| Christie et al. (2019, BT) | ∼0.46 | |
| Christie et al. (2019, BPW) | ∼9.4 | |
| Christie et al. (2019, BPS) | ∼28 | |
| Ruiz et al. (2019, 2020) | ∼2–3(c) | |
 mechanism, GW170817 |
||
| Zalamea & Beloborodov (2011) | 0.40 | 0.19 – 0.58 |
Notes. The first two entries represent the efficiency measured in this work. Other entries represent theoretical expectations for the Blandford & Znajek (1977) and 
annihilation mechanisms, either applied directly to GW170817 or based on simulations of generic BNS mergers. When applicable, we report both the median value and the 68% confidence interval.
Based on GRMHD simulations of geometrically thick accretion discs around rotating BHs, seeded with poloidal magnetic fields (see the caveats in Sect. 5.1). The fitting formulae are evaluated at the GW170817 remnant BH spin (see Appendix A).
Based on Tchekhovskoy & Giannios (2015).
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