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How to form a millisecond magnetar? Magnetic field amplification in protoneutron stars

Published online by Cambridge University Press:  17 October 2017

Jérôme Guilet ,
Ewald Müller ,
Hans-Thomas Janka ,
Tomasz Rembiasz ,
Martin Obergaulinger ,
Pablo Cerdá-Durán  and
Miguel-Angel Aloy
Jérôme Guilet
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany Max-Planck Princeton Center for Plasma Physics Laboratoire AIM, CEA/DRF-CNRS-Université Paris Diderot, IRFU/Département d’Astrophysique, CEA-Saclay, F-91191, France
Ewald Müller
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany
Hans-Thomas Janka
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany
Tomasz Rembiasz
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia C/ Dr. Moliner 50, 46100 Burjassot, Spain
Martin Obergaulinger
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia C/ Dr. Moliner 50, 46100 Burjassot, Spain
Pablo Cerdá-Durán
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia C/ Dr. Moliner 50, 46100 Burjassot, Spain
Miguel-Angel Aloy
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia C/ Dr. Moliner 50, 46100 Burjassot, Spain
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Abstract

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Extremely strong magnetic fields of the order of 1015G are required to explain the properties of magnetars, the most magnetic neutron stars. Such a strong magnetic field is expected to play an important role for the dynamics of core-collapse supernovae, and in the presence of rapid rotation may power superluminous supernovae and hypernovae associated to long gamma-ray bursts. The origin of these strong magnetic fields remains, however, obscure and most likely requires an amplification over many orders of magnitude in the protoneutron star. One of the most promising agents is the magnetorotational instability (MRI), which can in principle amplify exponentially fast a weak initial magnetic field to a dynamically relevant strength. We describe our current understanding of the MRI in protoneutron stars and show recent results on its dependence on physical conditions specific to protoneutron stars such as neutrino radiation, strong buoyancy effects and large magnetic Prandtl number.

Keywords

instabilitiesmagnetic fieldsMHDstars: neutronstars: magnetic fieldsstars: rotationsupernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S331: Supernova 1987A:30 years later - Cosmic Rays and Nuclei from Supernovae and their aftermaths , February 2017 , pp. 119 - 124
Copyright
Copyright © International Astronomical Union 2017 

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