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Astronomers discovered a third exoplanet orbiting red giant star HD 33142. All planets in this system are much bigger than Earth, the last one discovered being the smallest of them.
HD 33142 is a red giant, which means that the star is running out of hydrogen in its core and is starting to swell up. With 1,5 solar masses it has a radius more than 4 times bigger than the Sun does. The newly discovered exoplanet HD 33142 d is 60 times heavier than Earth (0.6 Jupiter mass) and its year lasts 90 days. The other two planets are bigger than Jupiter and farther than 1 AU from the star.
||HD 33142||397.3 ly||
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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.