These newly discovered stars may represent a new type of stellar object—unlike anything seen before
, emit long pulses of radio waves about every 20 minutes. This means they spin much more slowly than any known neutron star, and they have other odd traits as well.of Curtin University in Bentley, Western Australia, who led the discovery of both of these surprising sources.The mystery began in 2021, when Hurley-Walker, and colleagues discovered a slowly repeating radio pulse embedded in archival data from 2018.
Unlike the first star, which was observed pulsing for three months, the signal of J1839-10 was detected over decades. “We were able to line up all those pulses, arriving like clockwork over the course of the 33 years,” says Hurley-Walker. Like most spinning cosmic objects, a neutron star’s magnetic field doesn’t align with its rotation axis. If the star is magnetic enough, radiation can stream from its two magnetic poles, and as it spins, astronomers see a regularly pulsing signal. “That beam sweeps across our line of sight like a lighthouse,” explains Hurley-Walker.
“We expect so few that there is no way we could have detected two of them in such a small survey in a year’s time,” says
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