For the first time, astronomers are studying the aftermath of a kilonova - an epic burst of energy which occurs when two neutron star collide.
For the first time, astronomers are studying the aftermath of a kilonova — an epic burst of energy that occurs when two neutron stars collide and merge. NASA has used it Chandra X-ray Observatory to observe the kilonova GW170817, and the observations have raised some unexpected questions.
There was something strange about the X-ray readings from this event though. When the merger was first detected, Chandra quickly moved to observe the pair but, despite the epic burst of both visible and infrared light from the collision, there were no X-rays observed. But when Chandra looked again, nine days later, it did find X-rays.
“The fact that the X-rays stopped fading quickly was our best evidence yet that something in addition to a jet is being detected in X-rays in this source,” said co-author Raffaella Margutti of the University of California at Berkeley. “A completely different source of X-rays appears to be needed to explain what we’re seeing.”
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