Scientists said they had discovered a hot super-earth in orbit around nearby red dwarf star Gliese 486.
In order to detect a new celestial body, the scientists used combined methods of transit photometry and radial velocity spectroscopy, and also analyzed the observations of the MuSCAT2 instrument.
The planet they discovered, named Gliese 486b, is 2.8 times the mass of Earth and 30% larger than our planet. The composition of the planet is similar to Venus or Earth if they had metal cores.
Gliese 486b orbits the host star every 1.5 days at a distance of 2.5 million km. Despite the fact that the planet is so close to its star, it, according to the authors, has retained some of its original atmosphere. Therefore, the authors plan to continue observing it using the next generation of space and ground-based telescopes.
The diagram gives an estimate of the internal composition of individual exoplanets based on their masses and radii in terrestrial units. The red dot is Gliese 486b and the orange ones are planets of planets around cool stars like Gliese 486.
Gliese 486b rotates on its axis for the same amount of time as it does around its host star, so it always has the same side facing the star.
Although Gliese 486 is much fainter and colder than the Sun, its radiation is so intense that the planet’s surface heats up to 430 degrees Celsius. Because of this, the surface of Gliese 486b is likely more like the surface of Venus than the surface of the Earth. It is a hot and dry landscape with burning lava rivers. However, unlike Venus, Gliese 486b may have a thin atmosphere.