Nonradial superfluid modes in oscillating neutron stars

TL;DR

This paper presents the first self-consistent study of nonradial superfluid oscillation modes in nonrotating neutron stars at finite temperatures, revealing temperature-sensitive spectra and dynamic evolution during cooling.

Contribution

It introduces a realistic model for superfluid oscillations in neutron stars, including temperature-dependent effects and complex internal configurations.

Findings

Oscillation spectra contain modes highly sensitive to temperature changes.

Pulsation spectra evolve rapidly during neutron star cooling.

Identifies specific mode behaviors in multi-layer star configurations.

Abstract

For the first time nonradial oscillations of superfluid nonrotating stars are self-consistently studied at finite stellar temperatures. We apply a realistic equation of state and realistic density dependent model of critical temperature of neutron and proton superfluidity. In particular, we discuss three-layer configurations of a star with no neutron superfluidity at the centre and in the outer region of the core but with superfluid intermediate region. We show, that oscillation spectra contain a set of modes whose frequencies can be very sensitive to temperature variations. Fast temporal evolution of the pulsation spectrum in the course of neutron star cooling is also analysed.