CFHTWIR-Oph 98 B is a substellar object, either an exoplanet or asub-brown dwarf that orbits CFHTWIR-Oph 98 A, aM-typebrown dwarf.[1] The pair form a binary system. The primary is a M9–L1 dwarf and the secondary is anL dwarf with a spectral type of L2–L6. Both spectral types are estimated from photometry. The pair is separated by 200astronomical units and has a lowgravitational binding energy.[2] The primary Oph 98A has a spectrum taken in 2012 withVLT/ISAAC, matching a spectral type of M9.75 and fromSpitzer photometry and near-infrared photometry it is surrounded by a class IIdisk.[3] This disk has a mass of 0.135MJ according to a study usingSED-modelling.[4]
It orbits a star but its formation as an exoplanet is challenging or impossible.[2] If its formation scenario is known, it may explain the formation ofPlanet Nine. Planetary migration may explain its formation, or it may be abrown dwarf.
