THE HD 40307 PLANETARY SYSTEM: SUPER-EARTHS OR MINI-NEPTUNES?

@article{Barnes2009THEH4,
  title={THE HD 40307 PLANETARY SYSTEM: SUPER-EARTHS OR MINI-NEPTUNES?},
  author={Rory Barnes and Brian Jackson and Sean N. Raymond and Andrew A. West and Richard Greenberg},
  journal={The Astrophysical Journal},
  year={2009},
  volume={695},
  pages={1006-1011}
}
Three planets with minimum masses less than 10 M⊕ orbit the star HD 40307, suggesting these planets may be rocky. However, with only radial velocity data, it is impossible to determine if these planets are rocky or gaseous. Here we exploit various dynamical features of the system in order to assess the physical properties of the planets. Observations allow for circular orbits, but a numerical integration shows that the eccentricities must be at least 10 −4 . Also, planets b and c are so close… Expand
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