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

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    2010_01_hd136118.pdf (1.883Mb)
    Date
    2010-01
    Author
    Martioli, Elder
    McArthur, Barbara E.
    Benedict, G. Fritz
    Bean, Jacob L.
    Harrison, Thomas E.
    Armstrong, Amber
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    Abstract
    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."
    Department
    Astronomy
    Subject
    astrometry
    planetary systems
    stars: individual (hd136118)
    stars:
    low-mass, brown dwarfs
    techniques: radial velocities
    fine guidance sensor-3
    interferometric astrometry
    proxima centauri
    brown dwarfs
    stars
    parallax
    planets
    catalog
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34856
    Citation
    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.
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    • facebook
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    • CONTACT US
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    © The University of Texas at Austin