Gliese 876 e

Exoplanet orbiting the star Gliese 876
The orbits of the planets of Gliese 876. Gliese 876 e is the furthest planet from the star.

Gliese 876 e is an exoplanet orbiting the star Gliese 876 in the constellation of Aquarius. It is in a 1:2:4 Laplace resonance with the planets Gliese 876 c and Gliese 876 b: for each orbit of planet e, planet b completes two orbits and planet c completes four. This configuration is the second known example of a Laplace resonance after Jupiter's moons Io, Europa and Ganymede.[1] Its orbit takes 124 days to complete.

Gliese 876 e has a mass similar to that of the planet Uranus. Its orbit takes 124 days to complete, or roughly one third of a year. While the orbital period is longer than that of Mercury around the Sun, the lower mass of the host star relative to the Sun means the planet's orbit has a slightly smaller semimajor axis. Unlike Mercury, Gliese 876 e has a nearly circular orbit with an eccentricity of 0.055 ± 0.012.[1]

This planet, like b and c, has likely migrated inward.[4]

References

  1. ^ a b c Rivera, Eugenio J.; et al. (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. arXiv:1006.4244. Bibcode:2010ApJ...719..890R. doi:10.1088/0004-637X/719/1/890. S2CID 118707953.
  2. ^ Millholland, Sarah; et al. (2018). "New Constraints on Gliese 876—Exemplar of Mean-motion Resonance". The Astronomical Journal. 155 (3) 106. arXiv:1801.07831. Bibcode:2018AJ....155..106M. doi:10.3847/1538-3881/aaa894. S2CID 119011611.
  3. ^ a b Moutou, C.; Delfosse, X.; et al. (July 2023). "Characterizing planetary systems with SPIRou: M-dwarf planet-search survey and the multiplanet systems GJ 876 and GJ 1148". Astronomy & Astrophysics. arXiv:2307.11569.
  4. ^ Gerlach, Enrico; Haghighipour, Nader (2012). "Can GJ 876 host four planets in resonance?". Celestial Mechanics and Dynamical Astronomy. 113 (1): 35–47. arXiv:1202.5865. Bibcode:2012CeMDA.113...35G. doi:10.1007/s10569-012-9408-0. S2CID 254381557.
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The Gliese 876 system
Gliese 876Gliese 876 dGliese 876 cGliese 876 bGliese 876 e
Stars
  • Gliese 876
Planets
  • Gliese 876 d
  • Gliese 876 c
  • Gliese 876 b
  • Gliese 876 e
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  • e
Primary member type
Celestial objects by systems. Secondary members are listed in small print.
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    0–10 ly →
Main-sequence
stars
A-type
  • Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly)
  • white dwarf B
G-type
M-type
(red dwarfs)
Brown dwarfs
L-type
  • Luhman 16 (6.5029±0.0011 ly)
  • T-type brown dwarf B
Sub-brown dwarfs
and rogue planets
Y-type
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  • e
← 10–15 ly →
Subgiant stars
F-type
Main-sequence
stars
G-type
  • Tau Ceti (11.9118±0.0074 ly)
  • 4 (8?) planets: (b), (c), (d), e, f, g, h, (i)
K-type
M-type
(red dwarfs)
Degenerate
stars
White dwarfs
Brown dwarfs
T-type
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← 15–20 ly    
Subgiant stars
G-type
Main-sequence
stars
A-type
G-type
K-type
  • Groombridge 1618 (15.8857±0.0017 ly)
  • Omicron2 (40) Eridani (16.3330±0.0042 ly)
  • white dwarf B
  • red dwarf C
  • 70 Ophiuchi (16.7074±0.0087 ly)
  • K-type main-sequence star B
  • Gliese 570 (19.1987±0.0074 ly)
  • 2 red dwarfs: B, C
  • T-type brown dwarf D
  • 36 Ophiuchi (19.4185±0.0036 ly)
  • 2 K-type main-sequence stars: B, C
  • HR 7703 (19.609±0.013 ly)
  • red dwarf B
M-type
(red dwarfs)
Degenerate
stars
White dwarfs
Brown dwarfs
L-type
T-type
Y-type
Sub-brown dwarfs
and rogue planets
Y-type
Italic are systems without known trigonometric parallax.
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Constellation of Aquarius
Stars
Bayer
Flamsteed
Variable
HR
HD
Other
Exoplanets
Star clusters
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Galaxies
NGC
Other
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Category
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