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

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)


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 (2007 June and 2008 July). 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 dΩ = 0.146 ± 0.049 rad d-1, 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.

Original languageEnglish
Pages (from-to)409-419
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - Jul 2010
Externally publishedYes


  • Planetary systems
  • Stars: activity
  • Stars: individual: HD 189733
  • Stars: magnetic field

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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