An international team of astronomers has described a new exoplanet MOA-2009-BLG-266Lb, which is only 10 times larger than Earth by mass. Scientists have acted according to the method of gravitational microlensing, which can detect low-mass planets in wide orbits.As it turned out, the mass of the star is 0,56 ± 0,09 sunny. Planet moves around its orbit with semi-major axis of 3.2 (+1.9, -0.5) а.e.,making one revolution in 7.6 (+7.7, -1.4) years.MOA-2009-BLG-266Lb was one of the first low-mass exoplanet located in “snow line”, conventional boundary, which takes place at such a distance from the luminary, where the temperature allows the existence of hydrogen compounds (water, ammonia, methane) in the form of solid ice particles.
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In our solar system, this line, which is 2.7 a. e. from the star, separates the terrestrial planets from the gaseous giants. As the “parent” star MOA-2009-BLG-266Lb is approximately two times lower than the Sun, by weight, “snow line” passes at twice smaller distance from it (~ 1.5 a.e.).