Amazing news from the universe! For the first time, astronomers have tracked the birth of a magnetar, one of the most powerful magnets known, right at the center of a bright supernova. This groundbreaking discovery adds to our understanding of general relativity and how stars explode.
Magnetars are unique stellar remnants, created after massive stars explode. They pack the mass of the sun into an incredibly small space, producing magnetic fields so strong that they can even tear apart atoms. In fact, these magnetic forces are about 300 trillion times stronger than Earth’s magnetic field, which protects us from harmful solar storms.
Researchers have long believed that magnetars might explain “superluminous supernovas,” which are at least ten times brighter than typical supernovae. These spectacular light shows could be a result of magnetars accelerating particles during a stellar explosion. Until now, there was no direct evidence to support this theory. But a recent study published in *Nature* offers just that proof, looking at a superluminous supernova called SN 2024afav, which exploded in December 2024.
The team used over two dozen telescopes to observe this massive explosion, which was visible for more than 200 days. They noted that instead of fading away gradually like most supernovae, SN 2024afav displayed brightening and dimming patterns, supporting the idea that a magnetar was involved.
Alexei Filippenko, an astronomer at UC Berkeley, shared his excitement: “This is definitive evidence for a magnetar forming during a superluminous supernova’s core collapse. This is the first time we’ve ever seen a magnetar being born, which is really thrilling.”
Previous observations hinted at magnetar formation during events like neutron star mergers, but this marks the first solid evidence. Researchers estimate that the newly formed magnetar spins every 4.2 milliseconds, or 238 times a second.
One fascinating aspect of this discovery is the “chirps” in the supernova’s light curve, caused by an accretion disk of gas and dust enveloping the newborn magnetar. This disk may wobble due to Lense-Thirring precession, an effect predicted by Einstein’s theory. As it does, it periodically blocks and reflects light, transforming the magnetar into what some are calling a “strobing cosmic lighthouse.”
Joseph Farah, a researcher at UC Berkeley, noted that their analysis showed that only the Lense-Thirring effect accurately matched the observed timing of these light variations. “It’s the first time general relativity has been needed to explain a supernova’s mechanics,” he stated.
Astrophysicist Dan Kasen emphasized the significance of this find, saying that it finally reveals the powerful engine behind these supernova debris layers. However, the researchers caution that not all superluminous supernovas are linked to magnetars. Some may arise from gas and dust “cocoons” surrounding exploding stars.
Looking ahead, researchers plan to use the new Vera C. Rubin Observatory in Chile to spot similar “chirping” supernovae in the coming years. This is an exciting time for astronomy, with many more cosmic mysteries waiting to be explored!
