Luyten b

Luyten's Star b (GJ 273 b) is a confirmed exoplanet, likely rocky, orbiting within the habitable zone of the nearby red dwarf Luyten's Star. It is the fourth-closest potentially habitable exoplanet known, at a distance of 12 light-years. Only Proxima Centauri b, Ross 128 b, and GJ 1061 d are closer. Discovered alongside Gliese 273c in June 2017, Luyten b is a super-Earth of around 2.89 times the mass of Earth and receives only 6% more starlight than Earth, making it one of the best candidates for habitability. Luyten b is a super-Earth, meaning that it has a mass and/or radius greater than that of Earth, but less than that of Uranus or Neptune. Radial velocity measurements shows that the planet has a minimum mass of 2.89 M🜨, placing it at the lower end of the super-Earth range. The planet has not been found to transit its star, and as a result its true mass and radius are not known. Due to its low mass, the planet is likely terrestrial, with a predicted radius of 1.51 R🜨. Up to four candidate planets have been proposed around Luyten's Star. A 2020 study showed that if all four planets are present, their true masses must be close to their minimum masses for the system to be stable, with an upper limit of 3.03 M🜨 for Luyten b.