Gliese 86 b

Gliese 86 b, sometimes referred to as Gliese 86 A b (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 AB) 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]
Doppler spectroscopy
Orbital characteristics
0.113 AU (16,900,000 km)[3]
Eccentricity0.0416 ± 0.0072[3]
15.76491 ± 0.00039[3] d
2451903.36 ± 0.59[3]
269 ± 16[3]
Semi-amplitude376.7 ± 2.9[3]
StarGliese 86
Physical characteristics
Mass>3.91[3] MJ

    The preliminary astrometric measurements made with the Hipparcos space probe suggest 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.[4] 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.[5]

    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, it is a DQ6, with a mass 0.590 of the Sun, with an 8180K temperature.[6]

    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. Butler, R.; et al. (2007). "Planets Table". Catalog of Nearby Exoplanets. Retrieved 2007-08-02.
    4. 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.
    5. 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.
    6. Open Exoplanet Catalogue, Gliese 86

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