Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742905c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #429.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We perform a realistic simulation of Star-planet magnetic Interaction (SPI) based on the observed parameters of the HD 189733 planetary system. The simulation includes observed stellar magnetic field, stellar wind, a time-dependent planetary orbital motion and a planetary outflow. Based on the simulation's results, we find that the use of realistic stellar field results in sectors with different plasma properties in the stellar corona, where each sector crossing by the planet generates different SPI. A large reconnection event occurs when the planetary and stellar field are opposite in polarity. This reconnection event causes to a release of cold plasma from the planetary magnetosphere with significant mass flux. However, we define this flux as a magnetosphereic escape rather then atmospheric escape. In addition, the short duration of the reconnection event suggests that such SPI cannot be observed persistently, in particular when such signatures are being searched in radio bands. We also find that the total stellar mass flux carried by the stellar wind is modified during the planetary orbit, where the particular value depends on the temporal magnetic topology, and the average total stellar mass flux is reduced by the existence of the planet. A further study of SPI should involve a physical atmospheric escape from the planet, as well as the impact of stellar mass ejections on the planetary magnetosphere.
Cohen Ofer
Drake Jeremy J.
Garraffo Cecilia
Gombosi Tamas I.
Kashyap Vinay L.
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