The Mass Of The Candidate Exoplanet Companion To HD 136118 From Hubble Space Telescope Astrometry And High-Precision Radial Velocities

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Martioli, Elder
McArthur, Barbara E.
Benedict, G. Fritz
Bean, Jacob L.
Harrison, Thomas E.
Armstrong, Amber

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We use Hubble Space Telescope fine guidance sensor astrometry and high-cadence radial velocities for HD 136118 from the Hobby-Eberly Telescope with archival data from Lick to determine the complete set of orbital parameters for HD 136118 b. We find an orbital inclination for the candidate exoplanet of i(b) = 163 degrees.1 +/- 3 degrees.0. This establishes the actual mass of the object, M(b) = 42(-18)(+11) M(J), in contrast to the minimum mass determined from the radial velocity data only, M(b) sin i similar to 12 M(J). Therefore, the low-mass companion to HD 136118 is now identified as a likely brown dwarf residing in the "brown dwarf desert."



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Martioli, Eder, Barbara E. McArthur, G. Fritz Benedict, Jacob L. Bean, Thomas E. Harrison, and Amber Armstrong. "The Mass of the Candidate Exoplanet Companion to HD 136118 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities." The Astrophysical Journal, Vol. 708, No. 1 (Jan., 2010): 625.