2014/07/09 by S. Lalitha, K. Poppenhaeger, K. P. Singh +2 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Gamma-ray bursts and supernovae #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1088/2041-8205/790/1/l11
5 pages, 3 figures, published in APJL
openalex publication_date 2014/07/09 · arxiv created 2014/07/10 · arxiv updated 2014/07/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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 = 7.4 × 10 25 erg s −1 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 1.3 × 10 10 g s −1 and has lost a total of ≈2–5.6 M ⊕ .