Resolve the origin of variability in PSR J0543−67

Determine whether the time- and frequency-dependent emission variability of PSR J0543−67 results from intrinsic broadband nulling, scintillation, or both through higher-signal-to-noise detections.

Background

PSR J0543−67 disappears after approximately 1.5 hours across multiple sub-bands, suggesting broadband nulling, but scintillation cannot be excluded. The pulsar was also absent in two subsequent follow-up observations. The paper identifies higher-signal-to-noise detections as necessary to establish the cause of the observed intermittency.

References

The absence of signal over different frequency ranges after 1.5\,hr is suggestive of broadband nulling \citep{gajjar_14, naidu_17}. However, given the limited S/N, we cannot distinguish conclusively between intrinsic nulling and scintillation.

— Discovery of Hidden Extragalactic Pulsars in the Parkes Archival Data  (2610.12450 - Sengar et al., 8 Oct 2026) in Section 3.5, PSR J0543−67

However, because the low-flux states of PSRs~J0506$-$66 and J0543$-$67 cannot yet be unambiguously attributed to intrinsic nulling rather than scintillation, the current sample is insufficient to derive a reliable nulling fraction for the LMC pulsar population.

— Discovery of Hidden Extragalactic Pulsars in the Parkes Archival Data  (2610.12450 - Sengar et al., 8 Oct 2026) in Section 5, Conclusions