Black Hole Triggers Brightest Stellar Explosion Ever Recorded

An unprecedented cosmic explosion occurred when a black hole destroyed a massive star, releasing energy far exceeding any previously observed stellar-collapse event. This extraordinary phenomenon, named AT2024wpp and nicknamed the Whippet, briefly emitted as much energy as 400 billion Suns combined.

Such an event outshines typical supernovae and stands as the brightest explosion ever detected from a star’s collapse. Researchers attribute the outburst to a massive star that approached too close to a black hole, whose powerful gravity stretched and tore the star apart. Material from the star formed a superheated disk around the black hole, emitting intense X-rays and generating a strong wind that interacted with gas the star had expelled before its destruction.

Daniel Perley, Associate Professor of Astrophysics at Liverpool John Moores University and lead author of the study, explained at the American Astronomical Society’s annual meeting: “We discovered what we think is a black hole merging with a massive companion star, shredding it into a disk that feeds the black hole. It’s a rare and awe-inspiring phenomenon.”

Characteristics of the Record-Breaking Explosion

While black holes destroying stars, known as Tidal Disruption Events, have been observed before, the Whippet stands out for its immense scale, rapid evolution, and brightness. It belongs to a rare category called Luminous Fast Blue Optical Transients (LFBOTs), which emit bright blue and ultraviolet light and fade more quickly than standard supernovae.

Anna Ho, assistant professor of astronomy at Cornell University and co-author of the study, detected the Whippet shortly after its light reached Earth using the Zwicky Transient Facility at Palomar Observatory in California. Follow-up observations from the Liverpool Telescope in the Canary Islands and NASA’s Swift satellite confirmed the object’s intense blue color and X-ray emissions.

Distance measurements conducted by R. Michael Rich at UCLA and Yu-Jing Qin at Caltech demonstrated that the blast’s energy was too great to be explained by a normal supernova. Its extreme heat and rapid changes indicated a star being torn apart and consumed by a black hole.

Perley remarked, “Even though we suspected what it was, it was still extraordinary. This was many times more energetic than any similar event and more than any known explosion powered by the collapse of a star.” He added, “Not only do these events help us identify black holes, they provide a new way to identify where black holes occur and how they form and grow, and the physics of how this happens.”

Insights from Shock Waves and Surrounding Gas

The Whippet event also allowed astronomers to observe gas surrounding a star before its destruction, a phenomenon rarely seen directly. A shock wave expanded outward at approximately one-fifth the speed of light, colliding with dense nearby material before fading after about six months. Scientists believe the shock dissipated upon reaching the boundary of a bubble formed by gas the star had lost prior to the black hole encounter.

This surrounding gas played a crucial role in transforming the black hole’s feeding process into a luminous display. The accretion disk around the black hole produced X-rays and a powerful gas wind, which collided with the star’s earlier outflows. This interaction generated the blue optical and ultraviolet light observed in the initial days, followed by radio and millimeter emissions later.

Unresolved Mysteries in the Explosion’s Aftermath

One of the most puzzling findings emerged as the event dimmed. Initial spectra from Keck Observatory, Magellan Observatory, and the Very Large Telescope showed almost no identifiable chemical signatures. Later, weak traces of hydrogen and helium appeared. The helium was moving toward Earth at speeds exceeding 6,000 kilometers per second (about 3,700 miles per second), implying that some dense structure survived the initial explosion.

The research team suggests this may be a stream of material drawn from the star’s core during the black hole’s disruption. Alternatively, a more speculative hypothesis is that another object in the system—possibly a third star—was affected by the black hole’s particle wind and X-ray radiation.

The study detailing these findings is titled “AT 2024wpp: an extremely luminous fast ultraviolet transient powered by accretion onto a black hole,” authored by Daniel A Perley and colleagues, published on 10 April 2026 in the Monthly Notices of the Royal Astronomical Society (DOI: 10.1093/mnras/stag678).