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Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
In the crust of a neutron star, global torsional oscillations could occur in two elastic layers. The outer and inner layers are composed of spherical and cylindrical nuclei and of…
Constraints on the nuclear equation of state and the neutron star structure from crustal torsional oscillations
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
We systematically examine torsional shear oscillations of neutron star crusts by newly taking into account the possible presence of the phase of cylindrical nuclei. In this study,…
Probing crustal structures from neutron star compactness
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
With various sets of the parameters that characterize the equation of state (EOS) of nuclear matter, we systematically examine the thickness of a neutron star crust and of the past…
Probing nuclear bubble structure via neutron star asteroseismology
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
We consider torsional oscillations that are trapped in a layer of spherical-hole (bubble) nuclear structure, which is expected to occur in the deepest region of the inner crust of…
Possible identifications of newly observed magnetar quasi-periodic oscillations as crustal shear modes
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
Quasi-periodic oscillations (QPOs) discovered in soft-gamma repeaters (SGRs) are expected to help us to study the properties of matter in neutron stars. In earlier investigations,…
Constraining the density dependence of the nuclear symmetry energy from an X-ray bursting neutron star
Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
Neutrons stars lighter than the Sun are basically composed of nuclear matter of density up to around twice normal nuclear density. In our recent analyses, we showed that possible s…