Neutron Star–Neutron Star and Neutron Star–Black Hole Mergers: Multiband Observations and Early Warnings

The detections of gravitational waves (GWs) from binary neutron star systems and neutron star–black hole systems provide new insights into dense matter properties in extreme conditions and associated high-energy astrophysical processes. However, currently, information about the neutron star equation...

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Bibliographic Details
Published in:The Astrophysical journal 2022-02, Vol.926 (2), p.158
Main Authors: Liu, Chang, Shao, Lijing
Format: Article
Language:English
Subjects:
Astrophysics
Binary stars
Black holes
Compact binary stars
Deformation
Detectors
Equations of state
Formability
Gravitational wave astronomy
Gravitational wave detectors
Gravitational waves
Localization
Matrix methods
Neutron stars
Neutrons
Parameters
Quadrupoles
Sensors
Stars & galaxies
Stellar systems
Waveforms
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Summary:The detections of gravitational waves (GWs) from binary neutron star systems and neutron star–black hole systems provide new insights into dense matter properties in extreme conditions and associated high-energy astrophysical processes. However, currently, information about the neutron star equation of state (EoS) is extracted with very limited precision. Meanwhile, the fruitful results from the serendipitous discovery of the γ -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 especially focus on the parameters pertaining to the spin-induced quadrupole moment, tidal deformability, and sky localization. We demonstrate that (i) only with the help of multiband observations we can 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 1 order of magnitude. Furthermore, we have systematically compared the different limits from four planned decihertz detectors and adopting two widely used waveform models.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac3cbf