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

International audience 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 201...

Full description

Bibliographic Details
Published in:Monthly Notices of the Royal Astronomical Society
Main Authors: Fares, R., Moutou, C., Donati, J. -F., Catala, C., Shkolnik, E. L., Jardine, M. M., Cameron, A. C., Deleuil, M.
Other Authors: Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2013
Subjects:
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Canada
narval
Online Access:https://hal.science/hal-01439500
https://hal.science/hal-01439500/document
https://hal.science/hal-01439500/file/stt1386.pdf
https://doi.org/10.1093/mnras/stt1386
Description
Summary:International audience 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.

Similar Items