Searching for Star-Planet interactions within the magnetosphere of HD 189733

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 period or the beat period between the stellar rotation and the orbital periods). We report no clear evidence of magnetospheric interactions between the star and the planet. We also extrapolated the field in the stellar corona and calculated the planetary radio emission expected for HD 189733b given the reconstructed field topology. The radio flux we predict in the framework of this model is time variable and potentially detectable with LOFAR.

References in corpus (12)

• Large-scale magnetic topologies of early M dwarfs
• The On/Off Nature of Star-Planet Interactions
• Stellar activity of planetary host star HD 189733
• The Rossiter-McLaughlin effect of CoRoT-3b & HD189733b
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
• Magnetic cycles of the planet-hosting star Tau Bootis: II. a second magnetic polarity reversal
• Predicting low-frequency radio fluxes of known extrasolar planets
• Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733
• Hot Jupiters and stellar magnetic activity
• Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
• A stellar companion in the HD 189733 system with a known transiting extrasolar planet
• GMRT radio observations of the transiting extrasolar planet HD189733b at 244 and 614 MHz

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