Neutron Star$-$Neutron Star and Neutron Star$-$Black Hole Mergers: Multiband Observations and Early Warnings

Abstract

The detections of gravitational waves (GWs) from binary neutron star (BNS) systems and neutron star--black hole (NSBH) systems provide new insights into dense matter properties in extreme conditions and associated high-energy astrophysical processes. However, currently information about NS equation of state (EoS) is extracted with very limited precision. Meanwhile, the fruitful results from the serendipitous discovery of the $\gamma$-ray burst alongside GW170817 show the necessity of early warning alerts. Accurate measurements of the matter effects and sky location could be achieved by joint GW detection from space and ground. In our work, based on two example cases, GW170817 and GW200105, we use the Fisher information matrix analysis to investigate the multiband synergy between the space-borne decihertz GW detectors and the ground-based Einstein Telescope (ET). We specially focus on the parameters pertaining to spin-induced quadrupole moment, tidal deformability, and sky localization. We demonstrate that, (i) only with the help of multiband observations can we constrain the quadrupole parameter; and (ii) with the inclusion of decihertz GW detectors, the errors of tidal deformability would be a few times smaller, indicating that many more EoSs could be excluded; (iii) with the inclusion of ET, the sky localization improves by about an order of magnitude. Furthermore, we have systematically compared the different limits from four planned decihertz detectors and adopting two widely used waveform models.

19 pages, 10 figures; accepted by ApJ

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Cited by in corpus (13)

• The Science of the Einstein Telescope
• The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
• Rotation and deformation of strangeon stars in the Lennard-Jones model
• 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
• Electromagnetic Follow-up Observations of Binary Neutron Star Mergers with Early Warnings from Decihertz Gravitational-wave Observatories
• Anatomy of parameter-estimation biases in overlapping gravitational-wave signals
• Simultaneous bounds on the gravitational dipole radiation and varying gravitational constant from compact binary inspirals
• Extending the Fisher Information Matrix in Gravitational-wave Data Analysis
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• 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
• Prospects for joint multiband detection of intermediate-mass black holes by LGWA and the Einstein Telescope