تقرير
Numerical simulations of the Tayler-Spruit dynamo in proto-magnetars
| العنوان: | Numerical simulations of the Tayler-Spruit dynamo in proto-magnetars |
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| المؤلفون: | Barrère, Paul, Guilet, Jérôme, Raynaud, Raphaël, Reboul-Salze, Alexis |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, Physics - Fluid Dynamics |
| الوصف: | The Tayler-Spruit dynamo is one of the most promising mechanisms proposed to explain angular momentum transport during stellar evolution. Its development in proto-neutron stars spun-up by supernova fallback has also been put forward as a scenario to explain the formation of very magnetized neutron stars called magnetars. Using three-dimensional direct numerical simulations, we model the proto-neutron star interior as a stably stratified spherical Couette flow with the outer sphere that rotates faster than the inner one. We report the existence of two subcritical dynamo branches driven by the Tayler instability. They differ by their equatorial symmetry (dipolar or hemispherical) and the magnetic field scaling, which is in agreement with different theoretical predictions (by Fuller and Spruit, respectively). The magnetic dipole of the dipolar branch is found to reach intensities compatible with observational constraints on magnetars. Comment: 6 pages, 5 figures, (7 pages, 5 figures for the supplementary materials) accepted for publication in MNRAS Letters |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnrasl/slad120 |
| URL الوصول: | http://arxiv.org/abs/2306.12296 |
| رقم الأكسشن: | edsarx.2306.12296 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnrasl/slad120 |
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