HD 136118 b

HD 136118 b is a brown dwarf located approximately 171 light-years away in the constellation of Serpens Cauda. This object had a minimum mass of 11.9 times that of Jupiter. Due to its high mass the planet is likely to be very hot and possibly glowing faintly. The lower limit on its mass is only slightly less than the deuterium burning threshold that some astronomers use to distinguish between planets and brown dwarfs. Depending on the inclination of its orbit, the true mass could be above this limit. The orbit of the object is located at the average distance of 1.45 astronomical units from the parent star, taking 40 months to complete one eccentric orbit.

HD 136118 b
Discovery
Discovered byFischer "et al."[1]
Discovery site California
Discovery dateFebruary 7, 2002
Doppler Spectroscopy
Orbital characteristics
Apastron1.96 AU (293,000,000 km)
Periastron0.94 AU (141,000,000 km)
1.45 ± 0.25 AU (217,000,000 ± 37,000,000 km)
Eccentricity0.352 ± 0.006
1209 ± 24 d
3.31 y
Inclination163.1 ± 3
2450610.5 ± 3.7
316.4 ± 0.6
StarHD 136118
Physical characteristics
Mass42+11
−18 MJ

    On November 25, 2009, its inclination was calculated to be 163.1° and its true mass 42 times that of Jupiter, classifying this as a brown dwarf.[2]

    References
    1. Fischer, Debra A.; et al. (2002). "Planetary Companions to HD 136118, HD 50554, and HD 106252". Publications of the Astronomical Society of the Pacific. 114 (795): 529–535. Bibcode:2002PASP..114..529F. doi:10.1086/341677. JSTOR 10.1086/341677.
    2. Martioli, E.; et al. (2010). "The Mass of the Candidate Exoplanet Companion to HD136118 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities". The Astrophysical Journal. 708 (1): 625–634. arXiv:0911.4645. Bibcode:2010ApJ...708..625M. doi:10.1088/0004-637X/708/1/625.


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