X-Ray Emission from the Super-Earth Host GJ 1214
Data(s) |
20/07/2014
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Resumo |
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 ⊕. |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Lalitha , S , Poppenhaeger , K , Singh , K P , Czesla , S & Schmitt , J H M M 2014 , ' X-Ray Emission from the Super-Earth Host GJ 1214 ' The Astrophysical Journal. Letters , vol 790 , no. 1 , L11 . DOI: 10.1088/2041-8205/790/1/L11 |
Palavras-Chave | #planetary systems #stars: activity #stars: coronae #stars: individual: GJ 1214 #stars: late-type #stars: low-mass |
Tipo |
article |