Searching for star–planet interactions within the magnetosphere of HD 189733

  1. R. Fares1,2,*,
  2. J.-F. Donati1,*,
  3. C. Moutou2,*,
  4. M. M. Jardine3,*,
  5. J.-M. Grießmeier4,*,
  6. P. Zarka5,*,
  7. E. L. Shkolnik6,*,
  8. D. Bohlender7,*,
  9. C. Catala5,*,
  10. A. C. Cameron3,*

Article first published online: 12 MAY 2010

DOI: 10.1111/j.1365-2966.2010.16715.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 406, Issue 1, pages 409–419, July 2010

Additional Information

How to Cite

Fares, R., Donati, J.-F., Moutou, C., Jardine, M. M., Grießmeier, J.-M., Zarka, P., Shkolnik, E. L., Bohlender, D., Catala, C. and Cameron, A. C. (2010), Searching for star–planet interactions within the magnetosphere of HD 189733. Monthly Notices of the Royal Astronomical Society, 406: 409–419. doi: 10.1111/j.1365-2966.2010.16715.x

Author Information

  1. 1

    LATT–UMR 5572, CNRS & Univ. P. Sabatier, 14 Av. E. Belin, F–31400 Toulouse, France

  2. 2

    LAM–UMR 6110, CNRS & Univ. de Provence, 38 rue Fréderic Juliot-Curie, F–13013 Marseille, France

  3. 3

    School of Physics and Astronomy, Univ. of St Andrews, St Andrews, Scotland KY16 9SS

  4. 4

    Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, the Netherlands

  5. 5

    LESIA–UMR 8109, CNRS & Univ. Paris VII, 5 Place Janssen, F–92195 Meudon Cedex, France

  6. 6

    Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015-130, USA

  7. 7

    HIA/NRC, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada

* E-mail: rim.fares@ast.obs-mip.fr (RF); donati@ast.obs-mip.fr (J-FD); claire.moutou@oamp.fr (CM); mmj@st-andrews.ac.uk (MMJ); griessmeier@astron.nl (J-MG); philippe.zarka@obspm.fr (PZ); shkolnik@dtm.ciw.edu (ELS); david.bohlender@nrc-cnrc.gc.ca (DB); claude.catala@obspm.fr (CC); acc4@st-andrews.ac.uk (ACC)

Publication History

  1. Issue published online: 12 JUL 2010
  2. Article first published online: 12 MAY 2010
  3. Accepted 2010 March 11. Received 2010 March 11; in original form 2010 February 15

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Keywords:

  • stars: activity;
  • stars: individual: HD 189733;
  • stars: magnetic field;
  • planetary systems

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 (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.

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