An analogous relationship between planetary mass and composition exists within the solar system. (britannica.com)
The study also identified three potential planetary mass companions: one associated to a red dwarf, one to a brown dwarf, and one to another planet. (sciencedaily.com)
This is the first known example of a gravitationally bound pair of planetary mass objects, and astronomers can't agree on a name for them. (discovermagazine.com)