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| Paper: |
Evidence for Magnetic Star-Planet Interactions in HD 189733 |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1317 |
| Authors: |
Wolk, S. J.; Pillitteri, I.; Kashyap, V.; Cohen, O.; Lisse, C.; Knutson, H. A. |
| Abstract: |
We report on XMM-Newton observations of the planetary host star HD 189733.
The system has a close in planet and it can potentially affect the coronal structure via
interactions with the magnetosphere.
During the 2009 secondary eclipse we observed a softening of the X-ray spectrum
significant at level of ∼3σ.
Further, we observed the most intense flare recorded at either epochs. This flare occurred
3 ks after the end of the eclipse. The flare decay shows several minor ignitions
perhaps linked to the main event and hinting for secondary loops that emit triggered by the
main loop.
Magneto-Hydro-Dynamical (MHD) simulations show that the magnetic interaction between
planet and star enhances the density and the magnetic field in a region comprised
between the planet and the star because of their relative orbital/rotation motion. |
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