Because all neutron stars share a common equation of state , tidal deformability constraints from the compact binary coalescence GW170817 have implications for the properties of neutron stars in other systems .
Using equation-of-state insensitive relations between macroscopic observables like moment of inertia ( I ) , tidal deformability ( \Lambda ) and stellar compactness , we derive constraints on these properties as a function of neutron-star mass based on the LIGO-Virgo collaboration ’ s canonical deformability measurement , \Lambda _ { 1.4 } = 190 ^ { +390 } _ { -120 } .
Specific estimates of \Lambda , I , dimensionless spin \chi , and stellar radius R for a few systems targeted by radio or X-ray studies are extracted from the general constraints .
We also infer the canonical neutron-star radius as R _ { 1.4 } = 10.9 ^ { +1.9 } _ { -1.5 } km at 90 \% confidence .
We further demonstrate how a gravitational-wave measurement of \Lambda _ { 1.4 } can be combined with independent measurements of neutron-star radii to tighten constraints on the tidal deformability as a proxy for the equation of state .
We find that GW170817 and existing observations of six thermonuclear bursters in low-mass X-ray binaries jointly imply \Lambda _ { 1.4 } = 196 ^ { +92 } _ { -63 } at the 90 \% confidence level .