Gliese 86 b

from Wikipedia, the free encyclopedia
Exoplanet
Gliese 86 b
Constellation Eridanus
Position
equinox : J2000.0
Right ascension 02h 10m 14s
declination −50 ° 50 ′ 00 ″
Orbit data
Central star Gliese 86 (K0V)
Major semi-axis 0.113 AU
eccentricity 0.0416 ± 0.0072
Period of circulation (15.76491 ± 0.00039) d
Further data
Minimum dimensions 3.91 M ♃
distance 11 pc
Argument of the periastron ω (269 ± 16) °
Epoch of the periastron t JD 2451903.36 ± 0.59
Semi-amplitude (376.7 ± 2.9) m / s
history
discovery Mayor et al.
Date of discovery November 24, 1998, FranceFranceFrance 
Catalog names
Eq  86 (A) b, HD  13445 (A) b
More information
Radial velocity method

Gliese 86 b also Gliese 86 Ab (to better distinguish it from the binary star partner Gliese 86 B of the primary star Gliese 86 A ) or, for short, Gl 86 Ab is an extrasolar planet about 35 light years away from our solar system and is located in the constellation of Eridanus .

The exoplanet was discovered around the K dwarf star Gliese 86 A in November 1998 by a French research team at ESO . It orbits its parent star very closely and completes an orbit in 15 days, 18 hours and 15 minutes .

First astrometric studies by the Hipparcos - Satellite evidence to suggest that the planet an inclination has approximately 164 ° and a mass of more than 15 Jupiter masses , making it a brown dwarf would have done.

However, further analysis showed that the measurement data from Hipparcos are not accurate enough to obtain reliable astrometric data from substellar objects.

The measurement results of the radial velocities of Gliese 86 A show a linear trend if the influence of the planet Gl 86 Ab is factored out, an indication of physical coupling with its companion the white dwarf Gliese 86 B.

Individual evidence

  1. ^ Hipparcos catalog (ESA 1997)
  2. ↑ a b c d e f g Butler, R. et al .: Planets Table . In: Catalog of Nearby Exoplanets . 2007. Retrieved August 2, 2007.
  3. ↑ Michel Mayor , Didier Queloz , Udry et al.
  4. ^ Extrasolar Planet in Double Star System Discovered from La Silla , European Southern Observatory. November 24, 1998. Retrieved December 29, 2012. 
  5. ↑ Han et al. , David C. Black, George Gatewood: Preliminary astrometric masses for proposed extrasolar planetary companions . In: The Astrophysical Journal Letters . 548, No. 1, 2001, pp. L57-L60. bibcode : 2001ApJ ... 548L..57H . doi : 10.1086 / 318927 .
  6. ↑ Pourbaix, D. and Arenou, F .: Screening the Hipparcos astrometric based orbits of sub-stellar objects . In: Astronomy and Astrophysics . 372, No. 3, 2001, pp. 935-944. arxiv : astro-ph / 0104412 . bibcode : 2001A & A ... 372..935P . doi : 10.1051 / 0004-6361: 20010597 .

Web links