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An arm length stabilization system for KAGRA and future gravitational-wave detectors
T. Akutsu, M. Ando, K. Arai +198
Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities. Since achieving the resonances of the a…
Determination of properties of protoneutron stars toward black hole formation via gravitational wave observations
Hajime Sotani, Kohsuke Sumiyoshi
We examine the frequencies of the fundamental (-) and the gravity (-) mode in gravitational waves from accreting protoneutron stars (PNSs) toward black hole formation. For…
Application of the independent component analysis to the iKAGRA data
KAGRA Collaboration, T. Akutsu, M. Ando +244
We apply the independent component analysis (ICA) to the real data from a gravitational wave detector for the first time. Specifically we use the iKAGRA data taken in April 2016, a…
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…
Dependence of outer boundary condition on protoneutron star asteroseismology with gravitational-wave signatures
Hajime Sotani, Takami Kuroda, Tomoya Takiwaki +1
To obtain the eigenfrequencies of a protoneutron star (PNS) in the postbounce phase of core-collapse supernovae (CCSNe), we perform a linear perturbation analysis of the angle-aver…
Finite size effects on the light curves of slowly-rotating neutron stars
Hajime Sotani, Hector O. Silva, George Pappas
An important question when studying the light curves produced by hot spots on the surface of rotating neutron stars is, how might the shape of the light curve be affected by relaxi…