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

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 $\Delta \Omega \sim 10^0$ 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 $\Delta \Omega \sim 10^{-2}$ deg${}^2$ and time-of-merger accuracy with $\Delta t_c\sim 10^{-1}$ s; and (c) sources that do not merge during the 4-yr mission window, which enable possible early warnings, with $\Delta \Omega \sim 10^{-1}$ deg${}^2$ and $\Delta t_c\sim 10^0$ 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.

13 pages, 9 figures; accepted by ApJ

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• The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
• Kilonova and Optical Afterglow from Binary Neutron Star Mergers. II. Optimal Search Strategy for Serendipitous Observations and Target-of-opportunity Observations of Gravitational-wave Triggers
• Multiband gravitational wave observations of stellar binary black holes at the low to middle and high frequencies
• Dark-siren Cosmology with Decihertz Gravitational-wave Detectors
• Gravitational Wave Measurement in the Mid-Band with Atom Interferometers
• Prospects for detecting neutron star-white dwarf mergers with decihertz gravitational-wave observatories
• Prospects for Time-Domain and Multi-Messenger Science with eXTP