Five Planets Orbiting 55 Cancri

  title={Five Planets Orbiting 55 Cancri},
  author={Debra A. Fischer and Geoffrey W. Marcy and R. Paul Butler and Steven S. Vogt and Gregory Laughlin and Gregory W. Henry and David Abouav and Kathryn M. G. Peek and Jason T. Wright and John Asher Johnson and Chris McCarthy and Howard T. Isaacson},
  journal={The Astrophysical Journal},
Wereport18yearsof Dopplershiftmeasurementsof anearbystar,55Cancri,thatexhibitsstrongevidenceforfive orbiting planets. The four previously reported planets are strongly confirmed here. Afifth planet is presented, with an apparent orbital period of 260 days, placing it 0.78 AU from the star in the large empty zone between two other planets. The velocity wobble amplitude of 4.9 m s � 1 implies a minimum planet massM sini ¼ 45:7 M� . The orbital eccentricity is consistent with a circular orbit, but… Expand
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