Constraints on the Moment of Inertia of PSR J0737-3039A from GW170817

Continued observation of PSR J0737-3039, the double pulsar, is expected to yield a precise determination of its primary component's moment of inertia in the next few years. Since the moment of inertia depends sensitively on the neutron star's internal structure, such a measurement will con...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2018-12, Vol.868 (2), p.L22
Main Authors: Landry, Philippe, Kumar, Bharat
Format: Article
Language:English
Subjects:
Deformation
equation of state
Equations of state
Formability
gravitation
Gravitational waves
Inertia
Moments of inertia
Neutron stars
Neutrons
Pulsars
pulsars: individual (PSR J0737-3039)
stars: neutron
Wave measurement
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Summary:Continued observation of PSR J0737-3039, the double pulsar, is expected to yield a precise determination of its primary component's moment of inertia in the next few years. Since the moment of inertia depends sensitively on the neutron star's internal structure, such a measurement will constrain the equation of state of ultra-dense matter, which is believed to be universal. Independent equation-of-state constraints have already been established by the gravitational-wave measurement of neutron star tidal deformability in GW170817. Here, using well-known universal relations among neutron star observables, we translate the reported 90% credible bounds on tidal deformability into a direct constraint, , on the moment of inertia of PSR J0737-3039A. Should a future astrophysical measurement of I disagree with this prediction, it could indicate a breakdown in the universality of the neutron star equation of state.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aaee76