A Pair of Resonant Planets Orbiting GJ 876

@article{Marcy2001APO,
  title={A Pair of Resonant Planets Orbiting GJ 876},
  author={G. Marcy and R. Butler and D. Fischer and S. Vogt and J. Lissauer and E. Rivera},
  journal={The Astrophysical Journal},
  year={2001},
  volume={556},
  pages={296-301}
}
Precise Doppler measurements during 6 yr from the Lick and Keck observatories reveal two planets orbiting GJ 876 (M4V). The orbital Ðt yields companion masses of M sin i \ 0.56 and 1.89 orbital M J , periods of P \ 30.1 and 61.0 days, semimajor axes of a \ 0.13 and 0.21 AU, and eccentricities of e \ 0.28 and 0.10, respectively. The orbital periods are nearly in the ratio of 2:1, unprecedented among major planets but common among moons and asteroids. Moreover, the axes of the elliptical orbits… Expand
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