Slingshot prominences, formation, ejection and cycle frequency in cool stars

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Abstract

Stars lose mass and angular momentum during their lifetimes. Observations of H-alpha absorption of a number of low mass stars, show prominences transiting the stellar disc and being ejected into the extended stellar wind. Analytic modelling have shown these M-dwarf coronal structures growing to be orders of magnitude larger than their solar counterparts. This makes prominences responsible for mass and angular momentum loss comparable to that due to the stellar wind. We present results from a numerical study which used magnetohydrodynamic simulations to model the balance between gravity, magnetic confinement, and rotational acceleration. This allows us to study the time dependent nature of prominence formation. We demonstrate that a prominence, formed beyond the co-rotation radius, is ejected into the extended stellar wind in the slingshot prominence paradigm. Mass, angular momentum flux and ejection frequency have been calculated for a representative cool star, in the so-called Thermal Non-Equilibrium (TNE) regime.
Original languageEnglish
Pages (from-to)144-147
Number of pages4
JournalProceedings of the International Astronomical Union
Volume17
Issue numberS370
Early online date16 Aug 2023
DOIs
Publication statusE-pub ahead of print - 16 Aug 2023

Keywords

  • Sun: prominences
  • Methods: numerical
  • Stars: magnetic fields

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