Gliese 667 Cd

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Gliese 667 Cd
Extrasolar planet List of extrasolar planets
Gliese 667C system impression.jpg
This artist's impression shows the view from the exoplanet Gliese 667 Cd looking towards the planet’s parent star (Gliese 667C)
Parent star
Star Gliese 667C
Constellation Scorpius
Right ascension (α) 17h 18m 57.16483s
Declination (δ) −34° 59′ 23.1416″
Apparent magnitude (mV) 11.03
Mass (m) 0.31 M
Radius (r) 0.42 R
Temperature (T) 3700 K
Metallicity [Fe/H] −0.59 ± 0.10
Age 2–10 Gyr
Physical characteristics
Mass (m) 5–11 M
Stellar flux (F) 0.18
Temperature (T) 143 K
Orbital elements
Semimajor axis (a) 0.275 8 ± 0.000 3 AU
Eccentricity (e) 0.019
Orbital period (P) 92.0926 d
Discovery information
Discovery date 2013 (predicted earlier)
Discovery method Radial velocity (European Southern Observatory)
Discovery status Unconfirmed

Gliese 667 Cd is an unconfirmed exoplanet orbiting the star Gliese 667 C, which is a member of the Gliese 667 triple star system. It is slightly more massive than Gliese 667 Cc. It is likely an ice planet, located outside the system's habitable zone, and it has been suggested that Gliese 667 Cd could have a ocean under the ice.[1]

The existence of Gliese 667Cd was theorized in 2012 and was supported by a follow-up study in 2013.[2] Reanalysis of the data by Feroz and Hobson (2014) however indicates that the detection of this planet was actually a result of failing to properly account for correlated noise in the radial-velocity data.[3]


  1. ^ Anglada-Escudé, Guillem, et al (2013-06-07). "A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone". Astronomy & Astrophysics. arXiv:1306.6074. Bibcode:2013A&A...556A.126A. doi:10.1051/0004-6361/201321331. Retrieved 2013-06-25. 
  2. ^ Anglada-Escude, Guillem et al. (February 2012), "A planetary system around the nearby M dwarf GJ 667C with at least one super-Earth in its habitable zone", The Astrophysical Journal Letters, accepted, arXiv:/1202.0446, Bibcode:2012arXiv1202.0446A 
  3. ^ Feroz, F.; Hobson, M. P. (2014). "Bayesian analysis of radial velocity data of GJ667C with correlated noise: evidence for only two planets". Monthly Notices of the Royal Astronomical Society 437 (4): 3540–3549. arXiv:1307.6984. Bibcode:2014MNRAS.437.3540F.