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iPTF14hls was a supernova discovered in 2014. Typically they reach a brightness peak quickly and then fade over few months - but this star had several oscillations in brightness. To make it more confusing, archives from 1954 show a supernova at the same spot.
News article
Press release
Nature article
News article
This model can lead to multiple eruptions, but it doesn't fit well to other observations like the continuous observation of hydrogen from the star.Although researchers are still uncertain what caused iPTF14hls to go supernova twice, one theory is that the “zombie star” is actually a “pulsation pair instability supernova.”
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“These explosions were only expected to be seen in the early universe and should be extinct today,” said co-author Andy Howell, leader of the LCO supernova group. “This is like finding a dinosaur still alive today. If you found one, you would question whether it truly was a dinosaur.”
Press release
Nature article