NS5 - Highly magnetized neutron stars: theories, observations and connection with gamma-ray bursts |
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Speaker |
Torres-Forne, Alejandro |
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Coauthors |
Cerdá-Durán, Pablo; Font, Jose A. |
| Talk Title |
The Hidden Magnetic Field Model Revisited |
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Abstract |
The observation of several neutron stars with relatively low values of the surface magnetic field found in supernova remnants has led in recent years to controversial interpretations. A possible explanation is the slow rotation of the proto-neutron star at birth which is unable to amplify its magnetic field to typical pulsar levels. An alternative possibility, the hidden magnetic field scenario, seems to be favoured over the previous one due to the observation of three low magnetic field magnetars. This scenario considers the accretion of the fallback of the supernova debris onto the neutron star as the responsible for the observed low magnetic field. We have studied under which conditions the magnetic field of a neutron star can be buried into the crust due to an accreting fluid. We have considered a 1D calculation in general relativity to estimate the balance between the incoming accretion flow an the magnetosphere. Our study includes several models with different entropy, composition (including nuclear statistical equilibrium) and neutron star masses. |
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