| CFHTWIR-Oph 98 B | |
| Discovery Method: | Direct imaging |
| Discovered: | 2020 |
| Discoverer: | Fontanive et al. |
| Extrasolarplanet: | yes |
| Semimajor: | AU (mean separation) |
| Star: | CFHTWIR-Oph 98 A |
| Spectral Type: | L2-L6 |
CFHTWIR-Oph 98 B is a substellar object, either an exoplanet or a sub-brown dwarf that orbits CFHTWIR-Oph 98 A, a M-type brown dwarf.[1] The pair form a binary system. The primary is a M9–L1 dwarf and the secondary is an L dwarf with a spectral type of L2–L6. Both spectral types are estimated from photometry. The pair is separated by 200 astronomical units and has a low gravitational binding energy. The primary Oph 98A has a spectrum taken in 2012 with VLT/ISAAC, matching a spectral type of M9.75 and from Spitzer photometry and near-infrared photometry it is surrounded by a class II disk.[2] This disk has a mass of 0.135 according to a study using SED-modelling.[3]
It orbits a star but its formation as an exoplanet is challenging or impossible.[4] If its formation scenario is known, it may explain the formation of Planet Nine. Planetary migration may explain its formation, or it may be a brown dwarf.