Binary star system in the constellation Eridanus
Gliese 86 (13 G. Eridani, HD 13445) is aK-type main-sequence star approximately 35light-years away in theconstellation ofEridanus . It has been confirmed that awhite dwarf orbits the primary star. In 1998 theEuropean Southern Observatory announced that anextrasolar planet was orbiting the star.[ 12]
The primary companion (Gliese 86 A) is a K-type main-sequencestar ofspectral type K1V. The characteristics in comparison to theSun are 83% the mass, 79% the radius, and 50% the luminosity. The star has a close-orbiting massiveJovian planet .
Gliese 86 B is awhite dwarf located around 21 AU from the primary star, making the Gliese 86 system one of the tightest binaries known to host an extrasolar planet.[ 13] brown dwarf ,[ 14] [ 15] semimajor axis of 18.42 AU and aneccentricity of 0.3974.[ 16] [ 4] [ 4] [ 9]
The planet Gliese 86 b was discovered by the Swiss 1.2 mLeonhard Euler Telescope operated by theGeneva Observatory .[ 17] protoplanetary disk that was truncated at 2 AU from the parent star.[ 4]
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.
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