Two hyper-dense neutron stars potentially merged to create the event.
Kilonovas occur after the collision of two hyper-dense, which are the remnants of stars that have died in supernova explosions. Astronomers think they have spotted an afterglow in X-rays from the event, which is dubbed GW170817.
"We have entered uncharted territory here in studying the aftermath of a neutron star merger," lead researcher Aprajita Hajela, an astrophysics graduate student at Northwestern University, said in a of such an event by gravitational waves, or ripples of space-time. Astronomers continue to study the region to find out how the area is evolving., but the emission began to fade in early 2018. Hajela's team, however, showed the decline in brightness stopped in 2020, with the X-ray emission remaining nearly constant.
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