We investigated the detection rates and early warning parameters of binary neutron star (BNS) populations with decihertz gravitational-wave observatories in a realistic detecting strategy. Assuming 4 years' operation of B-DECIGO, we based on parameter precision to classify the detectable BNSs into three categories: (a) sources that merge within 1 year, which could be localized with an uncertainty of ΔΩ∼100 deg2; (b) sources that merge in 1-4 years, which take up three quarters of the total events and yield the most precise angular resolution with ΔΩ∼10−2 deg2 and time-of-merger accuracy with Δtc∼10−1 s; and (c) sources that do not merge during the 4-yr mission window, which enable possible early warnings, with ΔΩ∼10−1 deg2 and Δtc∼100 s. Furthermore, we compared the pros and cons of B-DECIGO with the third-generation ground-based detectors, and explored the prospects of detections using 3 other decihertz observatories and 4 BNS population models. In realistic observing scenarios, we found that decihertz detectors could even provide early-warning alerts to a source decades before its merger while their localizations are still as accurate as ground-based facilities. Finally we found a decrease of events when considering the confusion noise, but this could be partially solved by a proper noise subtraction.
@article{arxiv.2204.06161,
title = {Realistic Detection and Early Warning of Binary Neutron Stars with Decihertz Gravitational-wave Observatories},
author = {Chang Liu and Yacheng Kang and Lijing Shao},
journal= {arXiv preprint arXiv:2204.06161},
year = {2022}
}