Magnetar frame-dragging explains chirps in superluminous supernovae
Mar 13th 2026
A predictable chirp in the light from SN 2024afav points to a newborn magnetar dragging spacetime and making a tilted fallback disk wobble, offering a unified explanation for odd brightness patterns seen in the brightest supernovae.
- SN 2024afav displayed predictable, chirping brightness bumps with steadily decreasing intervals between peaks.
- Researchers attribute the modulations to Lense-Thirring frame-dragging from a rapidly spinning magnetar forcing a tilted fallback accretion disk to precess.
- As the disk shrinks because of declining fallback, precession speeds up and produces the observed chirp in the light curve.
- Chirp measurements constrain the central engine to a magnetar with a roughly 4.2 millisecond spin and a magnetic field strong enough to power the superluminous emission.
- The magnetar plus frame-dragging model also explains similar bumpy light curves in archival superluminous supernovae.
- Key uncertainties remain about disk formation and how magnetar radiation is reprocessed, and upcoming surveys like the Vera C. Rubin Observatory will be needed to test the model further.