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Gravitational wave (GW) astronomy has consolidated its role as a newobservational window to reveal the properties of compact binaries in theUniverse. In particular, the discovery of the first binary neutron starcoalescence, GW170817, led to a number of scientific breakthroughs as thepossibility to place constraints on the equation of state of cold matter atsupranuclear densities. These constraints and all scientific results based onthem require accurate models describing the GW signal to extract the sourceproperties from the measured signal.  In this article, we study potential systematic biases during the extractionof source parameters using different descriptions for both, the point-particledynamics and tidal effects. We find that for the considered cases the mass andspin recovery show almost no systematic bias with respect to the chosenwaveform model. However, the extracted tidal effects can be strongly biased,where we find generally that Post-Newtonian approximants predict neutron starswith larger deformability and radii than numerical relativity tuned models.Noteworthy, an increase in the Post-Newtonian order in the tidal phasing doesnot lead to a monotonic change in the estimated properties.  We find that for a signal with strength similar to GW170817, but observedwith design sensitivity, the estimated tidal parameters can differ by more thana factor of two depending on the employed tidal description of the waveformapproximant. This shows the current need for the development of better waveformmodels to extract reliably the source properties from upcoming GW detections.

Waveform systematics for binary neutron star gravitational wave signals: effects of the point-particle baseline and tidal descriptions