Induced Bias in Recovery of Spinning Neutron Star Binaries with Non-spinning Waveforms

We continue the investigation of the feasibility of constraining the neutron star equation of state through gravitational waves. In particular, focus was on the ability to accurately recover tidal deformabilities of spinning waveforms using parameter estimation with non-spinning waveforms. We compare the match of TaylorF2 waveforms at the 3.5PN order with spin to the 2.0PN order and tidal effects to the 6PN order beyond leading order. It was shown that spin effects drastically decrease the match between two waveforms with increasing dimensionless spin values. We study the effects of a range of spin values in injected waveforms on the recovery of tidal deformabilty using non-spinning templates. Recovered tidal deformabilities were over and underestimated at high dimensionless spin values and effect sizes increased with increasing dimensionless spin values. Our analysis makes it known that recovering spinning waveforms with non-spinning ones renders recovery of tidal deformabilities highly inaccurate.