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CFHTWIR-Oph 98 b

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Substellar object in a binary system
CFHTWIR-Oph 98 B
Hubble image of Oph 98 AB
Discovery
Discovered byFontanive et al.
Discovery date2020
Detection methodDirect imaging
Orbital characteristics
Semi-major axis200±6 AU (mean separation)
StarCFHTWIR-Oph 98 A
Physical characteristics
Mean radius1.86±0.05 RJ
Mass7.8+0.7
−0.8 MJ
Temperature1800±40 K
Spectral typeL2-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. 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. This disk has a mass of 0.135 MJ according to a study using SED-modelling.

Formation

It orbits a star but its formation as an exoplanet is challenging or impossible. 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. ^ 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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