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White dwarf is a dense core of dead star. Most of them have similar mass to the Sun, but sometimes astronomers find one so light, that it should not exist. The most accepted theory was, that the extremely low-mass white dwarfs (ELM) are created when a massive star nearby sucks away some of their mass. Astronomers now found a system where this is happening. And not just one.
|Gaia||19. 12. 2013||Ongoing|
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Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.