Realistic Detection and Early Warning of Binary Neutron Stars with Decihertz Gravitational-wave Observatories

Chang Liu; Yacheng Kang; Lijing Shao

doi:10.3847/1538-4357/ac7a39

paper

Realistic Detection and Early Warning of Binary Neutron Stars with Decihertz Gravitational-wave Observatories

arXiv:2204.06161 · doi:10.3847/1538-4357/ac7a39

Abstract

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 $ΔΩ \sim 1 0^{0}$ deg $^{2}$ ; (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 $ΔΩ \sim 1 0^{- 2}$ deg $^{2}$ and time-of-merger accuracy with $Δ t_{c} \sim 1 0^{- 1}$ s; and (c) sources that do not merge during the 4-yr mission window, which enable possible early warnings, with $ΔΩ \sim 1 0^{- 1}$ deg $^{2}$ and $Δ t_{c} \sim 1 0^{0}$ 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.

arXiv comment13 pages, 9 figures; accepted by ApJ

Realistic Detection and Early Warning of Binary Neutron Stars with Decihertz Gravitational-wave Observatories

Abstract

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