Astrophysicists challenge existence of hypernovae

New research published in the Monthly Notices of the Royal Astronomical Society challenges the existence of hypernovae, which are theorized to be core-collapse supernovae ten times more luminous and energetic than standard explosions.

Previously, astronomers used the unique low-metallicity of certain ancient stars in the Milky Way's halo and the Sculptor dwarf spheroidal galaxy to support the hypernova theory. It was assumed that these massive explosions mixed material uniformly into space, creating specific chemical signatures in subsequent generations of stars.

However, two new studies by astrophysicists Anmol Aggarwal and Ralph Schönrich from the Mullard Space Science Laboratory at University College London suggest that this uniform mixing does not occur. By re-examining metal-poor stars and a silver-and-uranium-rich red giant, the researchers indicate that hypernovae may not be responsible for these chemical compositions, potentially invalidating the primary evidence for their existence.