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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2013

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

R. Fares
  • Fonction : Auteur
C. Moutou
J. -F. Donati
C. Catala
  • Fonction : Auteur
E. L. Shkolnik
  • Fonction : Auteur
M. M. Jardine
  • Fonction : Auteur
A. C. Cameron
  • Fonction : Auteur
M. Deleuil

Résumé

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 Telescope 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 tau 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.
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hal-01439500 , version 1 (14-01-2022)

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R. Fares, C. Moutou, J. -F. Donati, C. Catala, E. L. Shkolnik, et al.. A small survey of the magnetic fields of planet-host stars. Monthly Notices of the Royal Astronomical Society, 2013, 435 (2), pp.1451--1462. ⟨10.1093/mnras/stt1386⟩. ⟨hal-01439500⟩
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