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Title: 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 XMM-Newton observations. We derive an X-ray luminosity of L{sub X} = 7.4 × 10{sup 25} erg s{sup –1} and a corresponding activity level of log (L{sub X} /L {sub 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{sup 10} g s{sup –1} and has lost a total of ≈2-5.6 M {sub ⊕}.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005 (India)
  2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  3. Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22365531
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 790; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; IRRADIATION; LUMINOSITY; MASS TRANSFER; PLANETARY ATMOSPHERES; SOLAR CORONA; STARS; STELLAR WINDS; X RADIATION; X-RAY DETECTION