Observations Link Magnetar Activity to Superluminous Supernova Light Variations
High-cadence observations of a Type I superluminous supernova reveal light-curve oscillations linked to a magnetar's properties, providing evidence of the Lense–Thirring effect in such environments.
Recent high-cadence multiband observations of a Type I superluminous supernova (SLSN-I) have revealed 'chirped' light-curve bumps—oscillations with decreasing periods—that can be directly associated with the characteristics of a central magnetar engine.
The data suggest a magnetar located at the core of the expanding supernova ejecta, encircled by an infalling accretion disk experiencing Lense–Thirring precession. This effect, predicted by general relativity, occurs when the rotation of a massive object causes the surrounding spacetime to drag, leading to precession of the orbiting material.
Analysis indicates that the light curve and bump frequency independently constrain the magnetar's spin period to approximately 4.2 milliseconds and its magnetic field strength to around 1.6 × 10¹⁴ gauss.
These findings provide the first observational evidence of the Lense–Thirring effect in a magnetar environment and support the magnetar spin-down model as an explanation for the extreme luminosity observed in SLSNe-I.
The study anticipates that this discovery will open new avenues for testing general relativity in the dynamic centers of young supernovae.