2014ApJ...790L..11L

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 L_X= 7.4x10²⁵ erg/s and a corresponding activity level of log (L_X/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 1.3x 10¹⁰ g/s and has lost a total of ~2-5.6 M_⊕.