Astronomers Confirm 4.2-Millisecond Magnetar in SN 2024afav via 4-Bump Chirp
Updated
Updated · spacedaily.com · Jul 11
Astronomers Confirm 4.2-Millisecond Magnetar in SN 2024afav via 4-Bump Chirp
2 articles · Updated · spacedaily.com · Jul 11
Summary
SN 2024afav, about 1 billion light-years away, delivered the first compelling evidence of a magnetar being born inside a supernova after astronomers tied its unusual light pattern to a hidden compact engine.
Four post-peak brightness bumps arrived progressively faster, creating a chirp that the Nature study says is best explained by a tilted fallback disk precessing through the Lense-Thirring frame-dragging effect.
Modeling of the supernova’s luminosity and chirp points to a newborn neutron star spinning every 4.2 milliseconds with a magnetic field roughly 300 trillion times stronger than Earth’s.
The result strengthens a 2010 theory that rapidly spinning magnetars power some superluminous supernovae, though spectra also suggest ejecta colliding with surrounding material contributed to parts of SN 2024afav’s light curve.
Rubin Observatory-era surveys could now use accelerating brightness fluctuations as a search signature, potentially uncovering dozens more newborn magnetars and clarifying how often they drive the brightest stellar explosions.
A 'chirping' supernova revealed a magnetar's birth. What other cosmic secrets hide within the flicker of distant starlight?
Einstein’s theory explained a star’s wobble a billion light-years away. What other cosmic mysteries can general relativity help us finally solve?
SN 2024afav’s "Chirp": First Direct Proof of Magnetar Formation and Relativistic Frame-Dragging in a Supernova
Overview
Astronomers observed supernova SN 2024afav and noticed distinctive 'bumps' in its light curve, which they called a 'chirp' because of its unique pattern. Joseph Farah identified these features and linked them to the birth of a magnetar, a highly magnetized neutron star. This discovery provided the first direct evidence of a magnetar forming during a supernova and revealed unique gravitational effects. The observation marked a groundbreaking moment in astrophysics, as it connected the supernova's unusual light pattern to the creation of a magnetar, offering new insights into the extreme physics of stellar explosions.