A small survey of the magnetic fields of planet-host stars

R. Fares, C. Moutou, J. F. Donati, C. Catala, E. L. Shkolnik, M. M. Jardine, A. C. Cameron, M. Deleuil

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

Using spectropolarimetry, we investigate the large-scale magnetic topologies of stars hosting close-in exoplanets. A small survey of 10 stars has been done with the twin instruments Télescope Bernard Lyot /NARVAL and Canada-France-Hawaii Telescope/ESPaDOnS between 2006 and 2011. Each target consists of circular polarization observations covering 7-22 d. For each of the seven targets in which a magnetic field was detected, we reconstructed the magnetic field topology using Zeeman-Doppler imaging. Otherwise, a detection limit has been estimated. Three new epochs of observations of t Boo are presented, which confirm magnetic polarity reversal. We estimate that the cycle period is 2 yr, but recall that a shorter period of 240 d cannot still be ruled out. The result of our survey is compared to the global picture of stellar magnetic field properties in the mass-rotation diagram. The comparison shows that these giant planet-host stars tend to have similar magnetic field topologies to stars without detected hot Jupiters. This needs to be confirmed with a larger sample of stars.

Original languageEnglish (US)
Pages (from-to)1451-1462
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number2
DOIs
StatePublished - Oct 1 2013
Externally publishedYes

Keywords

  • Activity - stars
  • Individual - stars
  • Magnetic field - planetary systems
  • Polarimetric - stars
  • Techniques

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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  • Cite this

    Fares, R., Moutou, C., Donati, J. F., Catala, C., Shkolnik, E. L., Jardine, M. M., Cameron, A. C., & Deleuil, M. (2013). A small survey of the magnetic fields of planet-host stars. Monthly Notices of the Royal Astronomical Society, 435(2), 1451-1462. https://doi.org/10.1093/mnras/stt1386