Observations Link Magnetar Activity to Superluminous Supernova Light Variations
High-cadence observations of a Type I superluminous supernova reveal light-curve oscillations consistent with a magnetar engine undergoing Lense–Thirring precession, providing evidence for the magnetar spin-down model.
Recent high-cadence, multiband observations of a Type I superluminous supernova (SLSN-I) have revealed light-curve oscillations that align with the behavior of a magnetar engine undergoing Lense–Thirring precession.
The study focused on SN 2024afav, a nearby SLSN-I, and identified 'chirped' light-curve bumps—oscillations with decreasing periods over time. These patterns suggest the presence of a magnetar at the core of the supernova, surrounded by an infalling accretion disk that is misaligned with the magnetar's spin axis. This misalignment leads to Lense–Thirring precession, a relativistic effect where the rotation of a massive object causes the surrounding spacetime to 'drag,' resulting in the observed light variations.
The analysis determined the magnetar's spin period to be approximately 4.2 milliseconds and its magnetic field strength to be around 1.6 × 10¹⁴ gauss. These findings provide observational evidence supporting the magnetar spin-down model as an explanation for the extreme luminosity observed in SLSNe-I.
This discovery also offers a new avenue for testing general relativity in the dynamic environments of young supernovae, as the observed precession is a direct consequence of relativistic frame-dragging effects.