A Planetary Companion to γ Cephei A

  title={A Planetary Companion to $\gamma$ Cephei A},
  author={A. P. Hatzes and William D. Cochran and Michael Endl and Barbara E. Mcarthur and Diane Beverly Paulson and Gordon Arthur Hunter Walker and Bruce Thomas Evison Campbell and Stephenson L. S. Yang},
  journal={The Astrophysical Journal},
We report on the detection of a planetary companion in orbit around the primary star of the binary system γ Cephei. High-precision radial velocity measurements using four independent data sets spanning the time interval 1981-2002 reveal long-lived residual radial velocity variations superposed on the binary orbit that are coherent in phase and amplitude with a period or 2.48 yr (906 days) and a semiamplitude of 27.5 m s-1. We performed a careful analysis of our Ca II H and K S-index… Expand
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