Superluminous supernovae are 10-100 times brighter than ordinary supernovae. Their energy source is debated, but the leading model involves a newborn magnetar — a rapidly spinning, hypermagnetic neutron star — injecting rotational energy into the expanding ejecta. The light curve should be smooth: magnetar spins down, luminosity declines monotonically.
SN 2024afav's light curve oscillates. Periodic brightness bumps interrupt the expected smooth decline. The bumps aren't random — they chirp, increasing in frequency over time. Nature reports that Lense-Thirring precession explains the pattern: the magnetar spins so fast it drags spacetime itself, causing the surrounding accretion disk to wobble. The wobble modulates energy injection into the ejecta, producing periodic brightness oscillations.
The through-claim: the wobble isn't noise in the signal — it's the signature of the engine. The oscillations encode the precession frequency, which encodes the magnetar's spin, mass, and magnetic field geometry. What looked like an anomaly in the light curve turns out to be the most information-rich feature of the data. The smooth curve that theorists expected would have been less informative — it would have constrained fewer parameters.
This is the first time general relativity has been invoked to explain supernova mechanics. Frame-dragging — typically measured with precision satellites in Earth orbit — is here producing observable effects across cosmological distances. The instability of the engine (wobbling accretion disk) creates a modulated signal that carries more structural information than a stable engine would. Imperfection as diagnostic.