Gliese 86 b (original) (raw)

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Jovian planet orbiting Gliese 86 A

Gliese 86 b

The exoplanet Gliese 86 Ab (min mass ~4 MJ) rendered by Celestia
Discovery
Discovered by Mayor et al.[1]
Discovery site France
Discovery date 24 November 1998[2]
Detection method Doppler spectroscopy
Orbital characteristics
Semi-major axis 0.1177+0.0015−0.0012 AU[3]
Eccentricity 0.0478±0.0024[3]
Orbital period (sidereal) 15.76491 ± 0.00039[4] d
Time of periastron 2451903.36 ± 0.59[4]
Argument of periastron 269 ± 16[4]
Semi-amplitude 376.7 ± 2.9[4]
Star Gliese 86
Physical characteristics
Mass ≥4.266+0.11−0.087 _M_J[3]

Gliese 86 b, sometimes referred to as Gliese 86 A b[3] (so as to distinguish the planet from companion star "B") and/or shortened to Gl 86 b, is an extrasolar planet approximately 35 light-years away in the constellation of Eridanus. The planet was discovered orbiting a K-type main-sequence star (Gliese 86 A) by French scientists in November 1998.[2] The planet orbits very close to the star, completing an orbit in 15.78 days.

Preliminary astrometric measurements made with the Hipparcos space probe suggested the planet has an orbital inclination of 164.0° and a mass 15 times that of Jupiter, which would make the object a brown dwarf.[5] However, further analysis suggests the Hipparcos measurements are not precise enough to reliably determine astrometric orbits of substellar companions, thus the orbital inclination and true mass of the candidate planet remain unknown.[6]

  1. ^ Michel Mayor, Didier Queloz, Udry et al.
  2. ^ a b "Extrasolar Planet in Double Star System Discovered from La Silla" (Press release). Garching, Germany: European Southern Observatory. November 24, 1998. Archived from the original on May 21, 2020. Retrieved December 29, 2012.
  3. ^ a b c d Zeng, Yunlin; Brandt, Timothy D.; Li, Gongjie; Dupuy, Trent J.; Li, Yiting; Mirek Brandt, G.; Farihi, Jay; Horner, Jonathan; Wittenmyer, Robert A.; Butler, R. Paul.; Tinney, Christopher G.; Carter, Bradley D.; Wright, Duncan J.; Jones, Hugh R. A.; O'Toole, Simon J. (2022). "The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au". The Astronomical Journal. 164 (5): 188. arXiv:2112.06394. Bibcode:2022AJ....164..188Z. doi:10.3847/1538-3881/ac8ff7. S2CID 245123923.
  4. ^ a b c d Butler, R.; et al. (2007). "Planets Table". Catalog of Nearby Exoplanets. Archived from the original on 2019-03-05. Retrieved 2007-08-02.
  5. ^ Han; Black, David C.; Gatewood, George (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal Letters. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927.
  6. ^ Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID 378792.