CFHTWIR-Oph 98 b
 Hubble image of Oph 98 AB | |
| Discovery | |
|---|---|
| Discovered by | Fontanive et al. |
| Discovery date | 2020 |
| Direct imaging | |
| Orbital characteristics | |
| 200±6 AU (mean separation) | |
| Star | CFHTWIR-Oph 98 A |
| Physical characteristics[a] | |
| 1.86±0.05 RJ | |
| Mass | 7.8+0.7 −0.8 MJ |
| Temperature | 1800±40 K |
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.[2] 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.[3] This disk has a mass of 0.135 MJ according to a study using SED-modelling.[4]
Formation
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 of Planet Nine. Planetary migration may explain its formation, or it may be a brown dwarf.
See also
Notes
- ^ for age of 3 Myr
References
- ^ "The Extrasolar Planet Encyclopaedia — CFHTWIR-Oph 98 b". Extrasolar Planets Encyclopaedia. Retrieved 11 September 2023.
- ^ a b Fontanive, Clémence; Allers, Katelyn N.; Pantoja, Blake; Biller, Beth; Dubber, Sophie; Zhang, Zhoujian; Dupuy, Trent; Liu, Michael C.; Albert, Loïc (2020-12-01). "A Wide Planetary-mass Companion to a Young Low-mass Brown Dwarf in Ophiuchus". The Astrophysical Journal. 905 (2): L14. arXiv:2011.08871. Bibcode:2020ApJ...905L..14F. doi:10.3847/2041-8213/abcaf8. ISSN 0004-637X.
- ^ Alves de Oliveira, C.; Moraux, E.; Bouvier, J.; Bouy, H. (2012-03-01). "Spectroscopy of new brown dwarf members of ρ Ophiuchi and an updated initial mass function". Astronomy and Astrophysics. 539: A151. arXiv:1201.1912. Bibcode:2012A&A...539A.151A. doi:10.1051/0004-6361/201118230. ISSN 0004-6361.
- ^ Rilinger, Anneliese M.; Espaillat, Catherine C. (2021-11-01). "Disk Masses and Dust Evolution of Protoplanetary Disks around Brown Dwarfs". The Astrophysical Journal. 921 (2): 182. arXiv:2106.05247. Bibcode:2021ApJ...921..182R. doi:10.3847/1538-4357/ac09e5. ISSN 0004-637X.
