The apparent orbital dispersion-measure variations in the Double Pulsar are a Doppler-processing artefact, and two smaller dispersive-smearing artefacts plus polynomial-predictor inaccuracy can bias timing and Shapiro-delay measurements for compact binaries.
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Tackling artefacts in the timing of relativistic pulsar binaries: towards the SKA
The apparent orbital dispersion-measure variations in the Double Pulsar are a Doppler-processing artefact, and two smaller dispersive-smearing artefacts plus polynomial-predictor inaccuracy can bias timing and Shapiro-delay measurements for compact binaries.