The r-mode instability windows of strange stars

TL;DR

This paper investigates the r-mode instability windows of strange stars with different quark matter phases, considering observational constraints and dissipation mechanisms, and suggests young pulsars could be strange stars with color-flavor-locked matter.

Contribution

It provides a detailed analysis of the r-mode instability windows of strange stars considering various phases and dissipation effects, aligning theoretical models with observational data.

Findings

Color-flavor-locked phase strange stars are consistent with young pulsar observations.

Additional dissipation mechanisms may be present in certain pulsars like SAX J1808.4-3658.

Young pulsars could be strange stars with color-flavor-locked quark matter.

Abstract

With the constraint from gravitational wave emission of a binary merger system (GW170817) and two-solar-mass pulsar observations, we investigate the r-mode instability windows of strange stars with unpaired and color-flavor-locked phase strange quark matter. Shear viscosities due to surface rubbing and electron-electron scattering are taken into account in this work. The results show that the effects of the equation of state of unpaired strange quark matter are only dominant at low temperature, but do not have significant effects on strange stars in the color-flavor-locked phase. A color-flavor-locked phase strange star, which is surrounded by an insulating nuclear crust, seems to be consistent with observational data of young pulsars. We find that an additional enhanced dissipation mechanisms might exist in SAX J1808.4-3658. Fast spinning young pulsar PSR J0537-6910 is a primary source for detecting gravitational waves from a rotating strange star, and young pulsars might be strange stars with color-flavor-locked phase strange quark matter.