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 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
⊕.
| Original language | English |
|---|---|
| Article number | L11 |
| Number of pages | 5 |
| Journal | The Astrophysical Journal Letters |
| Volume | 790 |
| Issue number | 1 |
| Early online date | 09 Jul 2014 |
| DOIs | |
| Publication status | Published - 20 Jul 2014 |
Keywords
- planetary systems
- stars: activity
- stars: coronae
- stars: individual: GJ 1214
- stars: late-type
- stars: low-mass