2013/07/24 by R. Farès, Rim Fares, C. Moutou +13 · 103 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Exoplanet #Magnetic field #Physics #Planet #Rotation period #Sky #Stars #Stellar, planetary, and galactic studies #Zeeman effect #astro-ph.SR
paper · pdf · doi:10.1093/mnras/stt1386
published in Monthly Notices of the Royal Astronomical Society 435(2), 1451-1462 (Oxford University Press) · Accepted for publication in Monthly Notices of The Royal Astronomical Society
arxiv created 2013/07/24 · openalex publication_date 2013/08/16 · arxiv updated 2015/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 τ 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.