Speaker
Description
Transitional millisecond pulsars (tMSPs) are a rare class of neutron star binaries that switch between accretion-powered and rotation-powered states, providing a unique laboratory to study the interaction between accretion flows and pulsar winds. Multiwavelength observations, particularly in the optical and X-ray bands, have revealed complex variability patterns in these systems, including correlated and anti-correlated behavior that remains not fully understood. In this work, we did a multiwavelength analysis of the tMSP candidate 3FGL J1544.6−1125 using three XMM–Newton observations. The Optical Monitor (OM) data were obtained with different filters (U, White, and V). We find that the optical emission shows a tendency toward anti-correlation with the X-ray flux, with the effect becoming more pronounced at longer wavelengths. Given the intrinsically weak optical signal, we apply Gaussian Process (GP) regression to denoise the OM light curves and enhance the detectability of variability features. The GP reconstruction reveals clearer optical structures and strengthens the observed anti-correlation. Furthermore, we find tentative evidence that the optical anti-correlation is associated with a time delay relative to the X-ray emission.
| Participate the oral/poster presentation award competition | Yes |
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