2MASS J04414489+2301513


2MASS J04414489+2301513 is a young brown dwarf approximately 470 light years away with an orbiting companion about 5–10 times the mass of Jupiter. The mass of the primary brown dwarf is roughly 20 times the mass of Jupiter and its age is roughly one million years.
It is not clear whether this companion object is a sub-brown dwarf or a planet. The companion is very large with respect to its parent and must have formed within 1 million years or so. This seems to be too big and too fast to form like a regular planet from a disk around the central object.
The 2MASS J04414489+2301513 system has a large separation companion, 2MASS J04414565+2301580, which in turn has a nearby small separation substellar companion. 2M J044145 has similar proper motion to 2M J044144 and is likely physically associated with the system. The entire system of 4 objects is then a hierarchical quadruple of two binary stars orbiting each other. The primary component has a spectral type of M4.5 and a red apparent magnitude of 14.2. Both components seem to be accreting mass from their stellar disks, as shown by their emission lines. The four stars have a total mass of only 26% of the Sun, making it the quadruple star system with the lowest mass known.