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Effect of superfluidity on neutron star crustal oscillations

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arxiv 1210.0955 v1 pith:26THOSOG submitted 2012-10-03 astro-ph.HE nucl-th

Hajime Sotani , Ken'ichiro Nakazato , Kei Iida , Kazuhiro Oyamatsu This is my paper · ORCID
classification astro-ph.HEnucl-th
keywords oscillationsneutronstarsuperfluiditycrustdensitydrippedfrequencies
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We consider how superfluidity of dripped neutrons in the crust of a neutron star affects the frequencies of the crust's fundamental torsional oscillations. A nonnegligible superfluid part of dripped neutrons, which do not comove with nuclei, act to reduce the enthalpy density and thus enhance the oscillation frequencies. By assuming that the quasi-periodic oscillations observed in giant flares of soft gamma repeaters arise from the fundamental torsional oscillations and that the mass and radius of the neutron star is in the range of 1.4 < M/M_SUN < 1.8 and 10 km < R < 14 km, we constrain the density derivative of the symmetry energy as 100 MeV < L < 130 MeV, which is far severer than the previous one, L > 50 MeV, derived by ignoring the superfluidity.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Zeeman effect in oscillations of magnetars with toroidal magnetic fields

    hep-ph 2024-11 conditional novelty 5.0 of 10

    For a magnetar with a toroidal magnetic field confined to its crust, the paper derives the Zeeman-split magneto-elastic oscillation spectrum and gives simple formulas and fit constants for frequencies across stellar masses.

  2. Bayesian analysis of the shear modulus in the neutron-star crust

    astro-ph.HE 2026-06 unverdicted novelty 4.0 of 10

    Bayesian modeling with informed priors reduces uncertainties in neutron-star crust shear properties, predicting torsional mode frequencies of 20-50 Hz compatible with observations.

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