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- W3099441481 abstract "We report the discovery of a third planetary-mass companion to the G0 star HD 74156. High-precision radial velocity measurements made with the Hobby-Eberly Telescope aided the detection of this object. The best-fit triple-Keplerian model to all the available velocity data yields an orbital period of 347 days and a minimum mass of 0.4 MJup for the new planet. We determine revised orbital periods of 51.7 and 2477 days and minimum masses of 1.9 and 8.0 MJup, respectively, for the previously known planets. Preliminary calculations indicate that the derived orbits are stable, although all three planets have significant orbital eccentricities (e = 0.64, 0.43, and 0.25). With our detection, HD 74156 becomes the eighth normal star known to host three or more planets. Further study of this system's dynamical characteristics will likely give important insight into planet formation and evolutionary processes." @default.
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- W3099441481 date "2008-01-10" @default.
- W3099441481 modified "2023-09-26" @default.
- W3099441481 title "Detection of a Third Planet in the HD 74156 System Using the Hobby‐Eberly Telescope" @default.
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- W3099441481 doi "https://doi.org/10.1086/523701" @default.
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