X-Ray Emission from the Super-Earth Host GJ 1214

S. Lalitha, K. Poppenhaeger, K.P. Singh, S. Czesla, J. H. M. M. Schmitt

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8 Citations (Scopus)


Stellar activity can produce large amounts of high-energy radiation, which is absorbed by the planetary atmosphere leading to irradiation-driven mass loss. We present the detection and an investigation of high-energy emission in a transiting super-Earth host system, GJ 1214, based on XMM-Newton observations. We derive an X-ray luminosity of LX = 7.4 × 1025 erg s-1 and a corresponding activity level of log (LX /L bol) ~ -5.3. Further, we determine a coronal temperature of about ~3.5 MK, which is typical for coronal emission of moderately active low-mass stars. We estimate that GJ 1214 b evaporates at a rate of 1.3× 1010 g s-1 and has lost a total of ≈2-5.6 M ⊕.
Original languageEnglish
Article numberL11
Number of pages5
JournalThe Astrophysical Journal Letters
Issue number1
Early online date09 Jul 2014
Publication statusPublished - 20 Jul 2014


  • planetary systems
  • stars: activity
  • stars: coronae
  • stars: individual: GJ 1214
  • stars: late-type
  • stars: low-mass


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