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Radio signals coming from different directions in the universe are not extraordinary. Most of them are common and come from known natural sources such as neutron stars and even our sun. However, what is unique about this recent discovery is that they were originally thought to come from a neutron star or magnetars, but it turned out that it was coming from a white dwarf, a dead star that was being orbited by a red dwarf.
A Signal That Shouldn’t Exist
Astronomers have tracked a radio signal that was repeating every 2 hours. It was coming from the direction of the Ursa Major constellation or the Big Dipper. This discovery shocked the scientists at the time because of its patterns and rhythms.
It was because, unlike the most common radio signals that we receive from outer space, FRBs or fast radio bursts, which are short, intense radio flashes, this radio signal was an LPRT or long-period radio transients. A slower and longer signal that repeats in rhythm. The pulses detected lasted from 30 seconds to 90 seconds and repeat every 2 hours or 125 minutes to be exact.
Read more: Space.com
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A Binary System Unlike Any Other
Since the radio signals that the astronomers receive are slow and longer than usual, they rule out the option that it was coming from a neutron star. Because these types of celestial bodies, particularly magnetars, have FRB or fast radio burst signals.
Using the MeerKAT telescope, along with follow‑ups in optical and X‑ray, scientists have precisely pinpointed the source of the radio signals to a binary system of two stars. A red dwarf and a white dwarf orbit each other every 125 minutes (just over 2 hours).
Red dwarf stars are the most common stars in the Milky Way galaxy, a very long-lived, but small and cool star. It is estimated to be much smaller than our own Sun, and only has about 50% or less of its total mass. While a white dwarf is a small, very dense star, usually the size of a planet, and is also called a dead star. This is because they exhausted their nuclear fuel and have already lost most of their outer layer, where only the hot core remains.
How the Pulses Are Made
Scientists believe that the red dwarf’s solar wind collides with the magnetic force of the white dwarf every time they orbit each other, which is what creates the repeated radio signals that we have detected.
Some people who have not heard that stars and other celestial bodies could also generate radio signals probably think that this came from an intelligent extraterrestrial creature or aliens.
However, we do not have any such evidence yet, but all of our best scientists are always looking around, trying to discover more and explore our universe. So, maybe someday, we might receive a repeated radio signal, this time it might come from someone instead of something.
Read more: Phys.org
A New Class of Cosmic Radio Beacons
This is a discovery that marks the first time a pulse of this length and pattern came from a binary system of a red dwarf and a white dwarf star. This challenges our ideas that these types of signals have always come from ultra-dense and powerful celestial objects like neutron stars or magnetars.
This could mean that we should double-check some of the past confirmed sources of radio signals that we have detected. We might have missed something, or we might be able to discover more systems like this throughout our galaxy.
Author's Final Thoughts
A simple pair of white and red dwarf stars just changed our understanding of radio emissions that are coming from all types of directions in our galaxies. This finding reminded us that the universe always has something new for us to discover. It is so big that it is currently impossible for humans, no matter how good our technology has become, to know it all.
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