Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..156g&link_type=abstract
XMM-Newton Proposal ID #06737401
Physics
Stars, White Dwarfs, Solar System, Wasp18
Scientific paper
Hot Jupiters are gas giant extrasolar planets close to their host stars. In two stellar systems with hot Jupiters, a cyclic variation of chromospheric activity synchronized to the planet's revolution, and not to the stellar rotation, was observed. The proposed mechanism to explain this activity enhancement is a magnetic interaction between the star and the hot Jupiter. The extrasolar planet WASP-18b is the first confirmed hot Jupiter that has an orbital period of less than one day; it is orbiting only 2.6 stellar radii above the stellar surface. Moreover, WASP-18 is one of the youngest known planet-hosting star. We propose a short observation of WASP-18 to characterize its X-ray flux and temperature in order to prepare a future longer X-ray observation of this remarkable system.
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