--- title: "Long-period Radio Transients Sourced from White Dwarf Binary Systems" url: https://newscentral.site/long-period-radio-transients-sourced-from-white-dwarf-binary-systems/ language: en publisher: "News Central Site" section: "Science" published: 2026-11-14T21:00:01.000Z updated: 2026-11-15T07:53:45.887Z id: 460d34dd-f30c-4ce7-9b07-4c247e8fea5f source: "Phys.org https://phys.org/news/2026-11-dead-star-radio-minutes-partner.html" attribution: "Link to https://newscentral.site/long-period-radio-transients-sourced-from-white-dwarf-binary-systems/ and name News Central Site when you quote or summarize this story." --- # Long-period Radio Transients Sourced from White Dwarf Binary Systems Astronomers have discovered a new source for long-period radio transients, which emit bright flashes of radio waves every few minutes to hours. Astronomers have been trying to understand a new type of cosmic object called long-period radio transients, which emit bright flashes of radio waves every few minutes to hours. These objects are believed to be linked to binary systems consisting of a small star called a red dwarf and a stellar remnant known as a white dwarf. Research published in Nature Astronomy reveals the first discovery of a different source for one of these enigmatic broadcasters: it involves a white dwarf, but this time with a partner that closely resembles our own sun. The finding sheds new light on the mystery surrounding long-period radio transients. Scientists began investigating natural explanations after initially ruling out extraterrestrial sources for these intermittent signals. One theory suggested they might be neutron star pulsars, which are collapsed cores of massive stars producing repeating radio flashes. The idea that slow-spinning neutron stars could produce radio waves was deemed unlikely in some models, prompting a search for alternative explanations. The discovery of the new source with a sun-like companion offers a fresh perspective on these enigmatic objects and their origins. Further research is needed to confirm whether this finding represents a broader phenomenon or an isolated case, but it already points towards a more nuanced understanding of long-period radio transients. The breakthrough came when researchers were able to trace the origin of these repeating radio signals back to their sources. One signal stood out as coming from a red dwarf star that likely orbits a white dwarf. The white dwarf is believed to be the remnant of a star similar to our sun, which has exhausted its fuel and shed its outer layers. The pattern that emerged across several long-period transients whose source stars could be identified was striking. In each case, the system consisted of a binary pair: a small, cool red dwarf paired with a white dwarf. This pairing is significant because it suggests that these systems may be more common than previously thought. Researchers were conducting a survey using the Murchison Widefield Array radio telescope in Western Australia when they stumbled upon something unusual. In late 2024, they employed a search method developed by doctoral student Csanád Horváth to scan for new long-period transients. The method proved effective, as it allowed them to detect short flashes of radio waves that appeared at regular intervals. These flashes arrived approximately every 7.9 minutes and were seen during a narrow window of about six hours. For the remaining 26 hours, no pulses were detected. This pattern is most likely explained by the presence of two stars in orbit around each other once every 32 hours, with the radio pulses visible only when they are aligned correctly. The MeerKAT telescope in South Africa pinpointed the source of the radio waves to a small region of the sky containing a single faint star. Further investigation by the Keck telescope in Hawaii revealed that this star is not a tiny red dwarf, but rather a G-type star with similar mass and temperature to our own sun. To confirm that the pulsing object is indeed a star and not a neutron star, astronomers analyzed the timing of the radio pulses. The pulses arrive up to 4 seconds earlier or later than expected due to the varying distance they travel around their orbit. The precise spectrum "fingerprint" of the sunlike star shows minimal wobbling as it orbits its partner, indicating that the sunlike star must be significantly heavier than the pulsing object. Measuring the size of the orbit, the time it takes for each orbit to complete, and combining these with the spectrum measurements allow astronomers to calculate the mass of the pulsing object. The result is that the pulsing object weighs about two-thirds as much as the sun, ruling out the possibility that it's a neutron star. A white dwarf pulsar has been discovered orbiting a star similar to the sun, marking a significant find in the field of astronomy. The unusual pairing is thought to have originated from a star that expanded into a giant and engulfed its companion, causing it to spiral inward and shrink its orbit before shedding its outer layers. This process likely occurred relatively recently in cosmic terms, making systems like this quite common throughout the universe. However, detecting these white dwarfs next to bright stars is extremely challenging due to the overwhelming glare of the latter obscuring the faint light emanating from the former. Fortunately, radio pulses can cut through the intense radiation emitted by the brighter star, allowing astronomers to detect and study these elusive objects that would otherwise remain invisible to optical and X-ray telescopes. Astronomers believe that discovering more white dwarf binaries could provide valuable insights into the lives and deaths of stars like our own sun, particularly in relation to Type Ia supernovae, which are thought to be the remnants of such systems. Astronomers have made an intriguing discovery involving a white dwarf binary system, where one star emits radio waves every 8 minutes while its companion closely resembles our sun. The white dwarf's rhythmic pulses are thought to be caused by the intense gravitational pull of its companion, which is likely a red giant. This phenomenon could provide valuable insights into the lives and deaths of stars like our own sun, particularly in relation to Type Ia supernovae. The discovery highlights the importance of continued research into binary star systems. The white dwarf's pulses are being studied by astronomers who believe that understanding their behavior will help them better grasp the processes involved in the evolution of single stars. --- Source: [Phys.org](https://phys.org/news/2026-11-dead-star-radio-minutes-partner.html) Published by News Central Site: https://newscentral.site/long-period-radio-transients-sourced-from-white-dwarf-binary-systems/