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SUMMARY:Numerical study of the Tayler-Spruit dynamo: from magnetar formati
 on to magnetic fields in stellar interiors - Paul Barrere (Geneva)
DTSTART:20250310T140000Z
DTEND:20250310T150000Z
UID:TALK227665@talks.cam.ac.uk
CONTACT:Loren E. Held
DESCRIPTION:The Tayler-Spruit dynamo is a subcritical dynamo driven by the
  Tayler instability in a stably stratified shear flow. This mechanism is o
 f particular interest to astrophysics as the generated strong large-scale 
 magnetic field could explain angular momentum transport during stellar evo
 lution and the formation of very magnetized neutron stars called magnetars
 . Due to its subcritical nature and stable stratification\, this dynamo ha
 s remained elusive in numerical simulations until the recent studies of Pe
 titdemange et al. and Barrère et al. I will present the results of 3D num
 erical simulations of the Tayler-Spruit dynamo and their implications for 
 astrophysical problems. Our results demonstrate the existence of different
  subcritical branches showing distinct magnetic field geometries and dynam
 ical behaviours\, which were not predicted by previous analytical studies.
  The strongest branch harbours magnetic fields which are consistent with t
 he observation of magnetars with low magnetic dipoles and in global agreem
 ent with analytical prescription for angular momentum transport in stellar
  radiative zones. Thus\, beyond capturing an unexpected rich dynamics of t
 he Tayler-Spruit dynamo\, our work provides a better understanding of the 
 formation of magnetars and the physics in stellar interiors.\n
LOCATION:MR14 DAMTP and online
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