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We find that the Hanford and Livingston detectors of Advanced LIGO derive adistinct posterior probability distribution of binary tidal deformabilitytilde{Lambda} of the first binary-neutron-star merger GW170817. By analyzingpublic data of GW170817 with a nested-sampling engine and the default TaylorF2waveform provided by the LALInference package, the probability distribution ofthe binary tidal deformability derived by the LIGO-Virgo detector network turnsout to be determined dominantly by the Hanford detector. Specifically, byimposing the flat prior on tidal deformability of individual stars, symmetric90% credible intervals of tilde{Lambda} are estimated to be 527^{+619}_{-345}with the Hanford detector, 927^{+522}_{-619} with the Livingston detector, and455^{+668}_{-281} with the LIGO-Virgo detector network. Furthermore, thedistribution derived by the Livingston detector changes irregularly when wevary the maximum frequency of the data used in the analysis. This feature isnot observed for the Hanford detector. While they are all consistent, thediscrepancy and irregular behavior suggest that an in-depth study of noiseproperties might improve our understanding of GW170817 and future events.

Discrepancy in tidal deformability of GW170817 between the Advanced LIGO twin detectors