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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.

Gliese 86 b
The exoplanet Gliese 86 Ab (min mass ~4 MJ) rendered by Celestia
Discovery
Discovered byMayor et al.[1]
Discovery site France
Discovery date24 November 1998[2]
Detection method
Doppler spectroscopy
Orbital characteristics
Semi-major axis
0.1177+0.0015
−0.0012 AU[3]
Eccentricity0.0478±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-amplitude376.7 ± 2.9[4]
StarGliese 86
Physical characteristics
Mass≥4.266+0.11
−0.087 MJ[3]

    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]

    The radial velocity measurements of Gliese 86 show a linear trend once the motion due to this planet are taken out. This may be associated with the orbital motion of the white dwarf companion star.

    Star Gliese 86 B, the second star in the binary system, has a spectral type of DQ6, with a mass 0.5425 M☉[3] and an 8180K temperature.[7]


    References


    1. Michel Mayor, Didier Queloz, Udry et al.
    2. "Extrasolar Planet in Double Star System Discovered from La Silla" (Press release). Garching, Germany: European Southern Observatory. November 24, 1998. Retrieved December 29, 2012.
    3. 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. (2021). "The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at $\approx$2 AU". arXiv:2112.06394 [astro-ph.EP].
    4. Butler, R.; et al. (2007). "Planets Table". Catalog of Nearby Exoplanets. 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. Archived from the original on 2015-11-06. Retrieved 2009-03-09.
    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.
    7. Open Exoplanet Catalogue, Gliese 86



    На других языках

    [de] Gliese 86 b

    Gliese 86 b auch Gliese 86 Ab (um ihn besser vom Doppelsternpartner Gliese 86 B des Primärsterns Gliese 86 A zu unterscheiden) oder kurz auch Gl 86 Ab ist ein extrasolarer Planet in etwa 35 Lichtjahren Entfernung von unserem Sonnensystem und befindet sich im Sternbild des Eridanus.
    - [en] Gliese 86 b

    [es] Gliese 86 Ab

    Gliese 86 b (también llamado Gliese 86 Ab para distinguirlo de la enana blanca Gliese 86 B) es un planeta orbitando a la estrella Gliese 86 A. Orbita a una distancia de 0,11 UA, completando una órbita cada 15,77 días.

    [ru] HD 13445 A b

    HD 13445 A b (Gliese 86 b) — экзопланета в двойной звёздной системе HD 13445 в созвездии Эридана. Находится на расстоянии примерно 35 световых лет от Солнца.


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