535 citations · 2k across the 66 of their papers we have counts for
66 papers
Relic of quadrupole deformation produced in a hot neutron star era
Yasufumi Kojima, Akira Dohi, Shota Kisaka +1
A newly born neutron star is expected to exhibit significant deviations from spherical symmetry, which decay with time. Determining how much deformation remains at present is cruci…
Correct criterion of crustal failure driven by intense magnetic stress in neutron stars
Yasufumi Kojima
Magnetar outbursts are powered by an intense magnetic field. The phenomenon has recently drawn significant attention because of a connection to some fast radio bursts that has been…
How different is the magnetic field at the core-crust interface from that at the neutron star surface? -- the range allowed in magnetoelastic equilibrium
Yasufumi Kojima, Shijun Yoshida
This study was focused on the investigation of a magnetic field penetrating from the core of a neutron star to its surface. The range of possible field configurations in the interm…
Evolutionary deformation toward the elastic limit by a magnetic field confined in the neutron--star crust
Yasufumi Kojima, Shota Kisaka, Kotaro Fujisawa
Occasional energetic outbursts and anomalous X-ray luminosities are expected to be powered by the strong magnetic field in a neutron star. For a very strong magnetic field, elastic…
Strong toroidal magnetic fields sustained by the elastic crust in a neutron star
Kotaro Fujisawa, Yasufumi Kojima, Shota Kisaka
We investigate new solutions for magnetized neutron stars with a barotropic core in magnetohydrodynamic (MHD) equilibrium and a magneto-elastic crust, which was neglected by previo…
Magnetically confined mountains on accreting neutron stars with multipole magnetic fields
Kotaro Fujisawa, Shota Kisaka, Yasufumi Kojima
Magnetically confined mountains on accreting neutron stars are candidates for producing continuous gravitational waves. We formulate a magnetically confined mountain on a neutron s…