Precise radial velocities of giant stars. II. Pollux and its planetary companion

  title={Precise radial velocities of giant stars. II. Pollux and its planetary companion},
  author={Sabine Reffert and Andreas Quirrenbach and David S. Mitchell and Simon H. Albrecht and Saskia Hekker and Debra A. Fischer and Geoffrey W. Marcy and R. Paul Butler},
  journal={The Astrophysical Journal},
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80 high-resolution spectra for Pollux at Lick Observatory yielding precise radial velocities with a mean error of 3.8 m s-1, providing the most comprehensive and precise data set available for this star. Our data confirm the periodicity previously seen in the radial velocities. We derive a period of 589.7 ± 3.5… Expand

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