The evolving magnetic topology of τ Boötis

Mengel, M. W. and Fares, R. and Marsden, S. C. and Carter, B. D. and Jeffers, S. V. and Petit, P. and Donati, J.-F. and Folsom, C. P. (2016) The evolving magnetic topology of τ Boötis. Monthly Notices of the Royal Astronomical Society, 459 (4). pp. 4325-4342. ISSN 0035-8711

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Abstract

We present six epochs of spectropolarimetric observations of the hot-Jupiter-hosting star tau Bootis that extend the exceptional previous multiyear data set of its large-scale magnetic field. Our results confirm that the large-scale magnetic field of tau Bootis 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, tau Bootis and this long-term monitoring campaign presents a unique opportunity for studying stellar magnetic cycles.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, according to the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 13 Sep 2016 04:46
Last Modified: 14 Mar 2017 04:14
Uncontrolled Keywords: magnetic fields, techniques polarimetric, stars activity, stars imaging, stars individual tau Boo, planetary systems
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stw828
URI: http://eprints.usq.edu.au/id/eprint/29663

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