HD 209458 b Magnetic Moment Measurement

Go down

HD 209458 b Magnetic Moment Measurement

Post by Sirius_Alpha on 25th November 2014, 2:34 pm

Magnetic moment and plasma environment of HD 209458b as determined from Lyα observations

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'!

Number of posts : 3816
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Back to top

Permissions in this forum:
You cannot reply to topics in this forum