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The evolving magnetic topology of τ Boötis

Abstract : 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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https://hal-insu.archives-ouvertes.fr/insu-03669459
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Submitted on : Tuesday, May 17, 2022 - 10:04:09 AM
Last modification on : Saturday, June 25, 2022 - 3:06:34 AM

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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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