Effect of superfluidity on neutron star oscillations

Hajime Sotani, Ken'ichiro Nakazato, Kei Iida, Kazuhiro Oyamatsu

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We consider how superfluidity of dripped neutrons in the crust of a neutron star affects the frequencies of the crust's fundamental torsional oscillations.Anon-negligible superfluid part of dripped neutrons, which do not comove with nuclei, acts to reduce the enthalpy density and thus enhance the oscillation frequencies. By assuming that the quasi-periodic oscillations observed in giant flares of soft gammarepeaters arise from the fundamental torsional oscillations and that themass and radius of the neutron star are in the range 1.4≤M/M ≤1.8 and 10≤R≤14 km, we constrain the density derivative of the symmetry energy as 100 ≲ L ≲ 130 MeV, which is far more severe than the previous one, L ≳ 50 MeV, derived by ignoring the superfluidity.

Original languageEnglish
Pages (from-to)L21-L25
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume428
Issue number1
DOIs
Publication statusPublished - May 2 2013

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superfluidity
neutron stars
oscillation
oscillations
crusts
crust
neutrons
enthalpy
flares
symmetry
nuclei
radii
effect
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Effect of superfluidity on neutron star oscillations. / Sotani, Hajime; Nakazato, Ken'ichiro; Iida, Kei; Oyamatsu, Kazuhiro.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 428, No. 1, 02.05.2013, p. L21-L25.

Research output: Contribution to journalArticle

Sotani, Hajime ; Nakazato, Ken'ichiro ; Iida, Kei ; Oyamatsu, Kazuhiro. / Effect of superfluidity on neutron star oscillations. In: Monthly Notices of the Royal Astronomical Society: Letters. 2013 ; Vol. 428, No. 1. pp. L21-L25.
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