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Exoplanet Science Seminar

X-ray Studies of Exoplanet Systems: A New Spin on the Age-Activity Relationship
Presented by Katja Poppenhaeger
Harvard-Smithsonian Center for Astrophysics

Thursday, April 11, 2013
4:00 P.M. in 169-336

Abstract
The magnetic activity of a planet-hosting star determines the high-energy environment of its exoplanet and is an important factor in understanding the exoplanetary evolution. X-ray and UV observations allow us to determine the high-energy input into the exoplanetary atmosphere, which is the main driver of planetary evaporation. X-ray emission is also directly connected to the stellar rotation; without external input of angular momentum, the star spins down over time due to magnetic breaking. However, if there is tidal interaction between a star and its Hot Jupiter, the spin-down of the host star may not follow the usual age/rotation/activity relations. I will discuss several sets of X-ray observations that provide new insights into both the evaporation of close-in exoplanets and a possibly altered age-activity relationship for host stars of such planets.


Center for Exoplanet Science


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