摘要：Aims. The post-Keplerian(PK) parameters inferred from pulsar timing provide a convenient way to test Einstein’s general theory of relativity. However, before obtaining a pure orbital decay P˙ b induced by gravitational wave radiation, which is one of the PK parameters, a number of factors need to be accounted for carefully. The effect of tidal dissipation on P˙ b has been thought of as negligible. Here, we investigate the data for possible effects of tidal dissipation on P˙ b. Methods. The possibility of the tidal dissipation as a contributor to P˙ b in a large sample of millisecond pulsar binaries is investigated in detail. Results. We collected a large sample of pulsar binaries with measured P˙ b. All of the systems are millisecond pulsars. The residual P˙Res b of these systems was obtained by subtracting the three normal effects, that is to say the effect of Shklovskii, line-of-sight acceleration, and gravitational radiation. Assuming that tidal dissipation is responsible for such a residual P˙Res b , the tidal parameters of these systems can be calculated and compared with the tidal models. Conclusions. The residual P˙Res b is distributed over the half positive and half negative. The dynamical tidal model can explain the residual P˙ b of millisecond pulsar-white dwarf binaries. And the Love number of the main-sequence companion of PSR J1227-4853 can be derived as a reasonable value k2 = 0.177+0.098 −0.058 with the equilibrium tidal model. Those results are compatible with the scenario of tidal dissipation. Additionally, a weak correlation between the tidal parameter and orbital period is revealed, likely originating in the tidal process of the recycled stage which is worthy of further investigation.
