Transejecta high-energy neutrino emission from binary neutron star mergers

The observations of a macronova/kilonova accompanied by gravitational waves from a binary neutron star merger (GW170817) confirmed that neutron star coalescences produce copious ejecta. The coincident gamma-ray detection implies the existence of a relativistic jet in this system. During the jet’s propagation within the ejecta, high-energy photons and neutrinos can be produced. The photons are absorbed by the ejecta, while the neutrinos escape and can be detected. Here, we estimate such transejecta neutrino emission, and discuss how neutrino observations could be used to differentiate between gamma-ray burst emission scenarios. We find that neutrinos from the internal shocks inside the ejecta may be detectable by IceCube within a few years of operation, and will likely be detected with IceCube-Gen2. The neutrino signals coincident with gravitational waves would enable us to reveal the physical quantities of the choked jets even without electromagnetic signals.

对伴随来自双中子星合并（GW170817）的引力波的巨新星/千新星的观测证实，中子星并合会产生大量抛射物。同时探测到的伽马射线意味着该系统中存在相对论性喷流。在喷流于抛射物内传播期间，可能会产生高能光子和中微子。光子被抛射物吸收，而中微子逃逸并可被探测到。在此，我们估算了这种穿过抛射物的中微子发射，并讨论了如何利用中微子观测来区分伽马射线暴发射情景。我们发现，在几年的运行时间内，冰立方可能探测到来自抛射物内部激波的中微子，并且很可能用冰立方 - 二代探测到。与引力波同时出现的中微子信号将使我们即使在没有电磁信号的情况下也能够揭示受阻喷流的物理量。