03/16/2026
FIND: we are made up of stardust and yet we are still just scratching the surface.
🌟 Astronomers have witnessed the birth of a magnetar for the first time, catching a newborn ultra-magnetized neutron star powering one of the brightest explosions in the universe.
Superluminous supernovae can be more than 10 times brighter than ordinary supernovae, and for two decades, nobody could fully explain why they stayed so bright for so long. In 2010, UC Berkeley physicist Dan Kasen proposed that a magnetar, a neutron star with a magnetic field hundreds of times stronger than a normal pulsar, could be the hidden engine.
Spinning over a thousand times per second, its rotating magnetic field would slam charged particles into the expanding supernova debris, keeping it lit up like a cosmic furnace. It was an elegant idea, but no one had ever proven a magnetar actually formed inside one of these explosions.
That changed with supernova SN 2024afav, discovered in December 2024 about a billion light-years away. Tracked for over 200 days by the Las Cumbres Observatory telescope network, the explosion's fading light didn't decay smoothly. Instead, it showed four distinct bumps with progressively shorter intervals between them, a pattern the team calls a "chirp."
Graduate student Joseph Farah showed that this chirp is caused by an accretion disk wobbling around the newborn magnetar due to a general relativistic effect called Lense-Thirring precession, where the spinning neutron star literally drags space-time around with it. As the disk spirals inward, it wobbles faster, producing the accelerating flicker. It is the first time general relativity has been needed to explain the mechanics of a supernova, and it provides the smoking gun that magnetars really do power these extraordinary blasts.
📄 RESEARCH PAPER
📌 Farah et al, "Lense-Thirring precessing magnetar engine drives a superluminous supernova", Nature (2026)
