Early warning of precessing neutron-star black-hole binary mergers with the near-future gravitational-wave detectors

Abstract

Since gravitational and electromagnetic waves from a compact binary coalescence carry independent information about the source, the joint observation is important for understanding the physical mechanisms of the emissions. Rapid detection and source localization of a gravitational wave signal are crucial for the joint observation to be successful. For a signal with a high signal-to-noise ratio, it is even possible to detect it before the merger, which is called early warning. In this letter, we estimate the performances of the early warning for neutron-star black-hole binaries, considering the precession effect of a binary orbit, with the near-future detectors such as A+, AdV+, KAGRA+, and Voyager. We find that a gravitational wave source can be localized in $100\mathrm{de}{\mathrm{g}}^2$ on the sky before $\sim 10$--$40\mathrm{s}$ of time to merger once per year.

arXiv commentMNRAS version (change author names)

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