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To the surprise of team members, given BOAT’s brightness, the remnants of the collapsar did not look exceptionally large.

The team modeled how the r-process should affect the shape of a collapsar’s light curve—how its brightness changes over time—then compared the model with the observed light curves from the 25 supernovae.

As theorists expected, what powered the burst was a type of supernova called a collapsar: a massive, rapidly rotating star that ran out of fuel and collapsed, blasting its outer layers into space before disappearing into a black hole.

A new study by Siegel, Barnes, and Metzger published in Nature suggests that an even rarer astrophysical event - the 'collapsar' - might actually fit the bill for dominating r-process element production.

A collapsar is a rapidly spinning massive star that winds up collapsing and creating a supernova.