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The outermost three of the known planets likely formed further away from the star, and migrated inward.[1]

Planetary systemEdit

The Gliese 876 planetary system planetary system[2][note 1][3][4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
d 6.83 ± 0.4 M 0.02080665 1.937780 0.207 ± 0.055
f (unconfirmed) 0.025 ± 0.001 MJ 10.01 ± 0.02 0.09 ± 0.046
g (unconfirmed) 0.118 ± 0.002 MJ 15.04 ± 0.04 0.007 ± 0.004
c 0.7142 ± 0.004 MJ 0.129590 ± 0.000024 30.0081 ± 0.008 0.25591 ± 0.0009
b 2.2756 ± 0.0045 MJ 0.208317 ± 0.00002 61.1166 ± 0.0086 0.0324 ± 0.0013
e 14.6 ± 1.7 M 0.3343 ± 0.0013 124.26 ± 0.70 0.055 ± 0.012

Notes Edit

  1. Uncertainties in the planetary masses and semimajor axes do not take into account the uncertainty in the mass of the star.

ReferencesEdit

  1. Gerlach, Enrico; Haghighipour, Nader (2012). "Can GJ 876 host four planets in resonance?". Celestial Mechanics and Dynamical Astronomy 113: 35–47. doi:10.1007/s10569-012-9408-0. Bibcode2012CeMDA.113...35G. 
  2. Rivera, Eugenio J.; Laughlin, Gregory; Butler, R. Paul; Vogt, Steven S.; Haghighipour, Nader; Meschiari, Stefano (July 2010). "The Lick-Carnegie Exoplanet Survey: A Uranus-mass Fourth Planet for GJ 876 in an Extrasolar Laplace Configuration". The Astrophysical Journal 719 (1): 890–899. doi:10.1088/0004-637X/719/1/890. Bibcode2010ApJ...719..890R. 
  3. Planet GJ 876 f
  4. Planet GJ 876 g

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