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American Astronomical Society, Astrophysical Journal Letters, 1(790), p. L11, 2014

DOI: 10.1088/2041-8205/790/1/l11

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

Journal article published in 2014 by S. Lalitha ORCID, K. Poppenhaeger, K. P. Singh ORCID, S. Czesla, J. H. M. M. Schmitt
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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. ; Comment: 5 pages, 3 figures, published in APJL