Artistic interpretation of SIMP J013656.5 + 093347, which is 200 million years old.
It happens that a brown dwarf may turn out to be a planet. This was discovered by a group led by Jonathan Gagne. It turned out that the brown dwarf closest to our star is a planemo (object of planetary mass).
Brown dwarfs are smaller than stars, but larger than giant planets. However, their size is not enough to continue the process of hydrogen synthesis (allows you to maintain a high temperature). Therefore, such celestial bodies gradually cool down. As the process stretches, the temperature can be as hot as that of a star, or cool, resembling a planet.
It turned out that the long-studied object J013656.5 + 093347 (SIMP0136) is a member of the planetary group Carina-Near (Near Carina). This is a moving group of stars with an age of 200 million years. Such associations are the most attractive sites for finding free-floating planes. With knowledge of age and temperature, you can determine the mass of the object. It exceeds the mass of Jupiter by 13 times. Interestingly, it is in the boundary state between the properties of the brown dwarf and the planetary ones. Free-floating planes are incredibly valuable, as they resemble the gas giant's exoplanets, orbiting stars like Saturn or Jupiter. It is difficult to observe the atmosphere of exoplanets, because their light is inferior to the brightness of the main stars.
Scientists have concluded that SIMP0136 is more like a planet, so it allows you to understand the atmosphere of the giant planets and the evolutionary stages. They are easier to explore, but difficult to detect, because they can hide in any celestial area. That is why they were found so little.
But the concrete find is unique also by the fact that fast-growing weather patterns were noticed on the surface.