Astronomers Observe Magnetar Formation During Supernova Explosion
Astronomers have observed the formation of a magnetar during a supernova explosion, providing evidence that such events can power superluminous supernovae.
In December 2024, astronomers detected supernova SN 2024afav, located approximately a billion light-years from Earth. Over a 200-day observation period using the Las Cumbres Observatory's global network of telescopes, researchers noted that, following its peak brightness, the supernova exhibited periodic oscillations in luminosity. These oscillations, occurring at progressively shorter intervals, resembled a 'chirp' pattern.
The team, led by Joseph Farah of the University of California, Santa Barbara, attributed this phenomenon to the formation of a magnetar—a highly magnetized, rapidly spinning neutron star—at the core of the supernova. Farah explained that the magnetar's intense magnetic field and rapid rotation could inject energy into the surrounding supernova debris, causing the observed brightness variations.
This observation supports the theory that magnetars can act as central engines powering superluminous supernovae, which are significantly brighter than typical supernovae. The findings also provide a new avenue for testing general relativity under extreme conditions, as the magnetar's gravitational effects influence the surrounding accretion disk, leading to the observed luminosity oscillations.
Future surveys, such as those planned with the Vera C. Rubin Observatory, aim to identify more supernovae exhibiting similar 'chirp' patterns, potentially leading to further discoveries of newborn magnetars and enhancing our understanding of stellar explosions.