Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...533l.151c&link_type=abstract
The Astrophysical Journal, Volume 533, Issue 2, pp. L151-L154.
Astronomy and Astrophysics
Astronomy
86
Stars: Binaries: General, Stars: Planetary Systems, Stars: Activity, Stars: Chromospheres, Stars: Coronae, Stars: Late-Type
Scientific paper
We present a first attempt to identify and quantify possible interactions between recently discovered extrasolar giant planets (and brown dwarfs) and their host stars, resulting in activity enhancement in the stellar outer atmospheres. Many extrasolar planets have masses comparable to or larger than Jupiter and are within a distance of 0.5 AU, suggesting the possibility of their significant influence on stellar winds, coronae, and even chromospheres. Beyond the well-known rotational synchronization, the interactions include tidal effects (in which enhanced flows and turbulence in the tidal bulge lead to increased magnetoacoustic heating and dynamo action) and direct magnetic interaction between the stellar and planetary magnetic fields. We discuss relevant parameters for selected systems and give preliminary estimates of the relative interaction strengths.
Cuntz Manfred
Musielak Zdzislaw E.
Saar Steven H.
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