Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..355s&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Other
15
Scientific paper
Many of the newly discovered exoplanets are apparently gas giants in close proximity to their parent stars. They therefore raise tides on their host stars and (if similar to Jupiter) will likely have substantial magnetospheres which can interact with stellar fields. Both tidal and magnetospheric interactions can enhance stellar activity levels. An initial search for such planet-induced activity using the Ca II IR triplet found no signal but recently a more sensitive study using the Ca II H and K lines has uncovered evidence for planet-enhanced emission on HD 179949 and hints of it in other systems. The phase dependence of the enhanced emission for HD 179949 suggests a magnetospheric interaction. We discuss a simple model for this interaction the implications of this possible detection for diagnosing exoplanetary magnetospheres and future observations.
Cuntz Manfred
Saar Steven H.
Shkolnik Evgenya
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