105 citations · 1.2k across the 30 of their papers we have counts for
12 papers · 1 filter
Merger-inspired rotation laws and the low-T/W instability in neutron stars
Andrea Passamonti, Nils Andersson
Implementing a family of differential rotation laws inspired by binary neutron-star merger remnants, we consider the impact of the rotation profile on the low-T/W instability. We u…
Towards asteroseismology of core-collapse supernovae with gravitational-wave observations - I. Cowling approximation
Alejandro Torres-Forné, Pablo Cerdá-Durán, Andrea Passamonti +1
Gravitational waves from core-collapse supernovae are produced by the excitation of different oscillation modes in the proto-neutron star (PNS) and its surroundings, including the…
Buoyancy and g-modes in young superfluid neutron stars
A. Passamonti, N. Andersson, W. C. G. Ho
We consider the local dynamics of a realistic neutron star core, including composition gradients, superfluidity and thermal effects. The main focus is on the gravity g-modes, which…
The intimate relation between the low T/W instability and the co-rotation point
Andrea Passamonti, Nils Andersson
We study the low T/W instability associated with the f-mode of differentially rotating stars. Our stellar models are described by a polytropic equation of state and the rotation pr…
Quasi-periodic oscillations in superfluid magnetars
A. Passamonti, S. K. Lander
We study the time-evolution of axisymmetric oscillations of superfluid magnetars with a poloidal magnetic field and an elastic crust, working in Newtonian gravity. Extending earlie…
Stratification, superfluidity and magnetar QPOs
A. Passamonti, S. K. Lander
The violent giant flares of magnetars excite QPOs which persist for hundreds of seconds, as seen in the X-ray tail following the initial burst. Recent studies, based on single-flui…
The evolution of the f-mode instability in neutron stars and gravitational wave detectability
A. Passamonti, E. Gaertig, K. D. Kokkotas. D. Doneva
We study the dynamical evolution of the gravitational-wave driven instability of the f-mode in rapidly rotating relativistic stars. With an approach based on linear perturbation th…
Nonlinear viscous damping and gravitational wave detectability of the f-mode instability in neutron stars
A. Passamonti, K. Glampedakis
We study the damping of the gravitational radiation-driven f-mode instability in rotating neutron stars by nonlinear bulk viscosity in the so-called supra-thermal regime. In this r…
Towards real neutron star seismology: Accounting for elasticity and superfluidity
A. Passamonti, N. Andersson
We study the effects of an elastic crust on the oscillation spectrum of superfluid neutron stars. Within the two fluid formalism, we consider Newtonian stellar models that include…
Hydrodynamics of rapidly rotating superfluid neutron stars with mutual friction
A. Passamonti, N. Andersson
We study time evolutions of superfluid neutron stars, focussing on the nature of the oscillation spectrum, the effect of mutual friction force on the oscillations and the hydrodyna…
Oscillations of rotating magnetised neutron stars with purely toroidal magnetic fields
S. K. Lander, D. I. Jones, A. Passamonti
We investigate the oscillation spectrum of rotating Newtonian neutron stars endowed with purely toroidal magnetic fields, using a time evolution code to evolve linear perturbations…
r-modes and mutual friction in rapidly rotating superfluid neutron stars
B. Haskell, N. Andersson, A. Passamonti
We develop a new perturbative framework for studying the r-modes of rotating superfluid neutron stars. Our analysis accounts for the centrifugal deformation of the star, and consid…