CFHTWIR-Oph 98 b

CFHTWIR-Oph 98 B
Hubble image of Oph 98 AB
Discovery
Discovered byFontanive et al.
Discovery date2020
Direct imaging
Orbital characteristics
200±6 AU (mean separation)
StarCFHTWIR-Oph 98 A
Physical characteristics[a]
1.86±0.05 RJ
Mass7.8+0.7
−0.8 MJ
Temperature1800±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

  1. ^ for age of 3 Myr

References

  1. ^ "The Extrasolar Planet Encyclopaedia — CFHTWIR-Oph 98 b". Extrasolar Planets Encyclopaedia. Retrieved 11 September 2023.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
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