This star system either formed from very little mass or was ejected from a larger system. It consists only of a small brown dwarf star.
Brown dwarfs are dim, cool and relatively short-lived as stars, burning deuterium by nuclear fusion for about 100 million years, before
existing indefinitely as super-hot star-like planets which slowly cool. Many are isolated, forming from small clouds of matter and so often
do not have any major planets as what little matter they do have often goes into making the central star or remains as uncondensed gas
and debris at some distance from the star (hotter stars evaporate much more of the gas and dust that forms around them). Some are
rogue, having been ejected from other star systems early on in their formation. Some do have planets, however. These systems are also
worth visiting as they allow close astrometric measurements which helps refine our models of star formation. There are also different
types of brown dwarfs and the more measurements we have, the more we understand about the different types.
This brown dwarf is light, even by brown dwarf standards, at 0.023 stellar masses, and is a Y-type dwarf, meaning that it is cool enough
to have a well-banded atmosphere resembling that of a gas giant planet.