Magnetized exoplanets

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Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006tafp.conf..282s&link_type=abstract

"Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies. Colloquium held at Observatoire de Haute Proven

Physics

1

Scientific paper

We monitored the chromospheric activity in the Ca II H and K lines of 10 stars with hot Jupiters - 5 for three years at the CFHT and 5 in a single run at the VLT. There is an intriguing, still tentative, correlation between short-term (night-to-night) stellar activity and the M_psini of the hot Jupiter. This is akin to the linear mass-magnetic moment relationship for the magnetised planets in the Solar System. Both HD 179949 and υ And have shown chromospheric activity synchronised to the orbital period of their hot Jupiters which implies magnetic, rather than tidal, interaction. Because of their small separation (<0.1 AU), many of the hot Jupiters lie within the Alfvén radius of their host stars, allowing direct magnetic interaction with the stellar surface. We discuss the conditions under which a planet's magnetic field might induce activity on the stellar surface and the probable reason why a relatively weak effect was seen for the prime candidate, τ Boo.

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