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dc.contributor.authorJardine, M.
dc.contributor.authorCameron, A. Collier
dc.contributor.authorDonati, J. -F.
dc.contributor.authorHussain, G A J
dc.identifier.citationJardine , M , Cameron , A C , Donati , J -F & Hussain , G A J 2020 , ' Slingshot prominences : coronal structure, mass-loss and spin-down ' , Monthly Notices of the Royal Astronomical Society , vol. 491 , no. 3 , stz3173 , pp. 4076-4088 .
dc.identifier.otherPURE: 264469366
dc.identifier.otherPURE UUID: 0d0eb2e5-9598-4da3-893c-7e4604706b7e
dc.identifier.othercrossref: 10.1093/mnras/stz3173
dc.identifier.otherORCID: /0000-0002-8863-7828/work/66398287
dc.identifier.otherORCID: /0000-0002-1466-5236/work/66398346
dc.identifier.otherWOS: 000512306500073
dc.identifier.otherScopus: 85104380354
dc.descriptionMJ and ACC acknowledge support from STFC consolidated grant number ST/R000824/1. JFD acknowledges funding from the European Research Council (ERC) under the H2020 research and innovation programme (grant agreement 740651 NewWorlds).en
dc.description.abstractThe structure of a star’s coronal magnetic field is a fundamental property that governs the high-energy emission from the hot coronal gas and the loss of mass and angular momentum in the stellar wind. It is, however, extremely difficult to measure. We report a new method to trace this structure in rapidly-rotating young convective stars, using the cool gas trapped on coronal field lines as markers. This gas forms “slingshot prominences” which appear as transient absorption features in H-α. By using different methods of extrapolating this field from the surface measurements, we determine locations for prominence support and produce synthetic H-α stacked spectra. The absorption features produced with a potential field extrapolation match well this those observed, while those from a non-potential field do not. In systems where the rotation and magnetic axes are well aligned, up to 50% of the prominence mass may transit the star and so produces a observable feature. This fraction may fall as low as  2% in very highly inclined systems. Ejected prominences carry away mass and angular momentum at rates that vary by two orders of magnitude, but which may approach those carried by the stellar wind.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectStars: coronaeen
dc.subjectStars: late-typesen
dc.subjectStars: magnetic fieldsen
dc.subjectStars: rotationen
dc.subjectStars: solar-typeen
dc.subjectQB Astronomyen
dc.titleSlingshot prominences : coronal structure, mass-loss and spin-downen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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