Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: HD 209458 b Magnetic Moment Measurement 25th November 2014, 2:34 pm | |
| Magnetic moment and plasma environment of HD 209458b as determined from Lyα observations http://www.sciencemag.org/content/346/6212/981 - Quote :
- Transit observations of HD 209458b in the stellar Lyman-α(Lyα) line revealed strong absorption in both blue and red wings of the line interpreted as hydrogen atoms escaping from the planet’s exosphere at high velocities. The following sources for the absorption were suggested: acceleration by the stellar radiation pressure, natural spectral line broadening, or charge exchange with the stellar wind. We reproduced the observation by means of modeling that includes all aforementioned processes. Our results support a stellar wind with a velocity of ≈400 kilometers per second at the time of the observation and a planetary magnetic moment of ≈1.6 × 1026 amperes per square meter.
_________________ Caps Lock: Cruise control for 'Cool'!
| |
|