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ToolsLander, S. K., Haensel, P., Haskell, B., Zdunik, J. L. and Fortin, M. (2021) Magnetic fields in late-stage proto-neutron stars. Monthly Notices of the Royal Astronomical Society, 503 (1). 875–895. ISSN 0035-8711
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Abstract
We explore the thermal and magnetic field structure of a late-stage proto-neutron star (proto-NS). We find the dominant contribution to the entropy in different regions of the star, from which we build a simplified equation of state (EOS) for the hot neutron star (NS). With this, we numerically solve the stellar equilibrium equations to find a range of models, including magnetic fields and rotation up to Keplerian velocity. We approximate the EOS as a barotrope, and discuss the validity of this assumption. For fixed magnetic field strength, the induced ellipticity increases with temperature; we give quantitative formulae for this. The Keplerian velocity is considerably lower for hotter stars, which may set a de facto maximum rotation rate for non-recycled NSs well below 1 kHz. Magnetic fields stronger than around 1014 G have qualitatively similar equilibrium states in both hot and cold NSs, with large-scale simple structure and the poloidal field component dominating over the toroidal one; we argue this result may be universal. We show that truncating magnetic field solutions at low multipoles leads to serious inaccuracies, especially for models with rapid rotation or a strong toroidal-field component.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | stars: evolution,stars: interiors,stars: magnetic fields,stars: neutron,stars: rotation,astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103 |
| Faculty \ School: | Faculty of Science > School of Physics (former - to 2024) |
| UEA Research Groups: | Faculty of Science > Research Groups > Quantum Matter Faculty of Science > Research Groups > Numerical Simulation, Statistics & Data Science |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 06 May 2021 00:03 |
| Last Modified: | 07 Nov 2024 12:43 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/79928 |
| DOI: | 10.1093/mnras/stab460 |
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