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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2016

The evolving magnetic topology of τ Boötis

M. W. Mengel
  • Function : Author
R. Fares
  • Function : Author
S. C. Marsden
  • Function : Author
B. D. Carter
  • Function : Author
S. V. Jeffers
  • Function : Author


We present six epochs of spectropolarimetric observations of the hot-Jupiter-hosting star τ Boötis that extend the exceptional previous multiyear data set of its large-scale magnetic field. Our results confirm that the large-scale magnetic field of τ Boötis varies cyclicly, with the observation of two further magnetic reversals; between 2013 December and 2014 May and between 2015 January and March. We also show that the field evolves in a broadly solar-type manner in contrast to other F-type stars. We further present new results which indicate that the chromospheric activity cycle and the magnetic activity cycles are related, which would indicate a very rapid magnetic cycle. As an exemplar of long-term magnetic field evolution, τ Boötis and this long-term monitoring campaign presents a unique opportunity for studying stellar magnetic cycles.
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insu-03669459 , version 1 (17-05-2022)



M. W. Mengel, R. Fares, S. C. Marsden, B. D. Carter, S. V. Jeffers, et al.. The evolving magnetic topology of τ Boötis. Monthly Notices of the Royal Astronomical Society, 2016, 459, pp.4325-4342. ⟨10.1093/mnras/stw828⟩. ⟨insu-03669459⟩
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