GJ 1214 b

GJ 1214 b, also Gliese 1214 b, one in 2009 discovered extrasolar super-Earth. In its discovery by Zachory Berta he was the most Earth-like exoplanet. It is about 40 light years from Earth and orbits in 38 hours in the constellation Ophiuchus the red dwarf GJ 1214, whose radiation is 200 times weaker than that of our sun. The distance to its host star is about 0.014 AU ( approximately 2 million km). Its mass corresponds to about 7 Earth masses, its radius is estimated at just over two and a half Earth radii.

There is strong evidence that GJ 1214 b is surrounded by a relatively thick atmosphere. The equilibrium temperature of the exoplanet depends on several factors, some of which are only imprecisely known or not known. Estimates indicate that an equilibrium temperature in the range of about 120 to 280 degrees Celsius. Which is based on an albedo of 0.75 ( at 120 ° C) and from 0 ( at 282 ° C).

Observations by the Hubble telescope have shown that the atmosphere of GJ 1214 b may be composed primarily of water vapor. It is therefore assumed that the planet itself consists largely of water.


  • David Charbonneau, Zachory K. Berta, Jonathan Irwin, Christopher J. Burke, Philip Nutzman, Lars A. Have book, Christophe Lovis, Xavier Bonfils, David W. Latham, Stéphane Udry, Ruth A. Murray - Clay, Matthew J. Holman, Emilio E. Falco, Joshua N. Winn, Didier Queloz, Francesco Pepe, Michel Mayor, Xavier Delfosse, Thierry Forveille: A super- Earth transiting a nearby low -mass star. In: Nature. 462, No. 17 December 2009, 2009, pp. 891-894. arXiv: 0912.3229. doi: 10.1038/nature08679. Accessed on December 15, 2009.
  • David A. Aguilar: Astronomers Find Super - Earth Using Amateur, Off-the -Shelf Technology. Harvard - Smithsonian Center for Astrophysics. 16 December 2009. Retrieved on December 15, 2009.
  • MEarth: looking for transiting, habitable super- Earths around small stars. Retrieved on 16 December 2009.
  • Zachory K. Berta, David Charbonneau, Jean -Michel Désert et al.: The Flat Transmission Spectrum of the Super - Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope. In: Astrophysics > Earth and Planetary Astrophysics. (astro - ph.EP ) arXiv: 1111.5621, 23 Nov. 2011, last accessed on 5 Sept. 2013, full text as a PDF file.
  • Zachory K. Berta, David Charbonneau, Jacob Bean et al.: The GJ1214 Super - Earth System: Stellar Variability, New Transits, and a Search for Additional Planets. In: The Astrophysical Journal. ( ApJ ) 2011, Vol 736, No. 1, Article No. 12, doi: 10.1088/0004-637X/736/1/12.
  • Jonathan D. Fraine, Drake Deming, Michaël Gillon et al. Spitzer Transits of the Super - Earth GJ1214b and Implications for its atmosphere. In: '' The Astrophysical Journal. ( ApJ ), 2013, Vol 765, No. 2, Article No. 127, doi: 10.1088/0004-637X/765/2/127.
  • Norio Narita et al.: Multi-color Photometry of GJ 1214b transit through BJHK s bands and a long-term monitoring of the Stellar Variability of FY 1214. In: The Astrophysical Journal. ( ApJ ), 2013, Vol 773, Iss. Issue 2, Article No. 127, pp. 144, doi: 10.1088/0004-637X/773/2/144.