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X-ray emission from the super-Earth host GJ 1214

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 an XMM-Newton observation. We derive an X-ray luminosity LX=7.4E25 erg/s and a corresponding activity level of log(LX/Lbol)~ -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 1.3E10 g/s and has lost a total of ~2-5.6 MEarth.

preprint2014arXivOpen access
S. LalithaK. PoppenhaegerK. P. SinghS. CzeslaJ. H. M. M. Schmitt
astro-ph.EPastro-ph.SR
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S. LalithaK. PoppenhaegerK. P. SinghS. CzeslaJ. H. M. M. Schmitt

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