Betelgeuse B Revealed: Astronomers Capture Clearest Image of Star's Companion

Astronomers have captured the clearest image yet of Betelgeuse B, a faint stellar companion orbiting the well-known red supergiant star Betelgeuse. This significant observation, made with the Very Large Telescope (VLT) in Chile, offers compelling evidence that the famous star in the constellation Orion is not solitary but accompanied by another celestial body. The discovery is transforming the scientific understanding of Betelgeuse and its future evolution. For about a century, the astronomical community has searched for a companion star to Betelgeuse, a star easily visible to the naked eye known for its fluctuating brightness. This search was partly motivated by the desire to explain Betelgeuse's variable luminosity. While previous evidence, including a potential detection by the Gemini North Telescope, existed, the new images from the VLT provide the most solid confirmation to date. "I jumped out of my chair when I saw the processed images," admitted Montargès, an astronomer at the Paris Observatory–PSL. The team utilized the VLT's SPHERE instrument in December 2024, after two studies published in 2024 predicted that the companion would be in an optimal position for detection. After months of data processing, the image revealed Betelgeuse B directly by capturing its light. Contrary to earlier assumptions that Betelgeuse B might be as massive as the Sun, the new observations indicate it possesses a mass of approximately two to three times that of our Sun. This finding is crucial for understanding the dynamics and evolutionary path of the Betelgeuse system. Researchers plan to observe the companion again in about a year, on the opposite side of Betelgeuse, to further solidify their findings.

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I jumped out of my chair when I saw the processed images.