Searching for Star-Planet interactions within the magnetosphere of HD 189733
R. Fares, J.-F. Donati, C. Moutou, M.M. Jardine, J.-M. Griessmeier, P., Zarka, E.L. Shkolnik, D. Bohlender, C. Catala, A.C. Cameron

TL;DR
This study investigates the magnetic field and activity of HD 189733 to detect star-planet interactions, finding no clear evidence but predicting potentially detectable radio emissions from the planet.
Contribution
First detailed magnetic field mapping of HD 189733 using spectropolarimetry, exploring star-planet magnetic interactions and predicting radio emissions.
Findings
HD 189733 has a mainly toroidal magnetic field up to 40 G.
Stellar activity is mainly modulated by stellar rotation.
No clear evidence of star-planet magnetic interactions was found.
Abstract
HD 189733 is a K2 dwarf, orbited by a giant planet at 8.8 stellar radii. In order to study magnetospheric interactions between the star and the planet, we explore the large-scale magnetic field and activity of the host star. We collected spectra using the ESPaDOnS and the NARVAL spectropolarimeters, installed at the 3.6-m Canada-France-Hawaii telescope and the 2-m Telescope Bernard Lyot at Pic du Midi, during two monitoring campaigns (June 2007 and July 2008). HD 189733 has a mainly toroidal surface magnetic field, having a strength that reaches up to 40 G. The star is differentially rotating, with latitudinal angular velocity shear of domega = 0.146 +- 0.049 rad/d, corresponding to equatorial and polar periods of 11.94 +- 0.16 d and 16.53 +- 2.43 d respectively. The study of the stellar activity shows that it is modulated mainly by the stellar rotation (rather than by the orbital…
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