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HD 141399’s Retinue of Four Giant Planets

30 Apr 2014, 06:00 UTC
HD 141399’s Retinue of Four Giant Planets
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A planetary system consisting of 4 giant planets has been detected around HD 141399, a nearby, slightly evolved, K-type star. This discovery was made by Vogt et al. (2014) using precise radial velocity data from the HIRES (High Resolution Echelle Spectrometer) instrument on the Keck-I telescope and the Levy spectrometer on Lick Observatory’s Automated Planet Finder (APF). 91 observations spread over 10.5 years indicate the presence of 4 planets with orbital periods of 94.35, 202.08, 1070.35 and 3717.35 days, and minimum masses of 0.46, 1.36, 1.22 and 0.69 Jupiter-mass. In order of increasing distance from the host star, the 4 planets are dubbed HD 141399 b, c, d and e.Figure 1: Artist’s impression of a ringed giant planet with a moon in the foreground. Image credit: Nick Stevens.Figure 2: Artist’s impression of a giant planet.Compared to the Sun, HD 141399 has 1.59 ± 0.39 times its luminosity, 1.46 ± 0.15 times its radius and 1.14 ± 0.08 times its mass. HD 141399 is a rare example of a star with a planetary system consisting of multiple giant planets. Other examples of such planetary systems include Upsilon Andromedae - a system of 4 giant planets, and 55 Cancri A - a ...

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