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Non-linear oscillations of hydrodynamic tori: One ring to rule them all...

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  • UserCallum Fairbairn - DAMTP, Cambridge
  • ClockThursday 26 November 2020, 13:00-14:00
  • HouseOnline.

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Oscillations are invoked to explain a range of astrophysical phenomena and discs are no exception. High frequency Quasi-Periodic Oscillations (QPOs) around compact objects are often modelled as oscillations of thick tori. However, the non-linear regime which is most relevant to observations, is still not well understood. Tilting modes in such rings, which break the symmetry about the mid-plane, may also match onto and extend our understanding of warped discs in the limit of thin tori.

To this end I have developed a novel ‘ring model’ which acts as a framework to investigate both slender tori and extended warps. Through a combination of semi-analytical methods I will talk about the discovery of highly non-linear resonant solutions, which couple extreme breathing modes to the tilt. These represent precessing warped structures in the previously untreated inviscid, Keplerian regime.

This talk is part of the DAMTP Astro Mondays series.

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