Thin accretion disks around neutron and quark stars

TL;DR

This paper explores how the emission spectra from accretion disks around various compact objects, including neutron and quark stars, can be used to distinguish their types and underlying equations of state through observational signatures.

Contribution

It provides detailed calculations of emission properties for accretion disks around different neutron and quark star models, proposing a method to differentiate them observationally.

Findings

Distinct electromagnetic signatures for different star types.

Potential to test equations of state via accretion disk spectra.

Differences in flux, temperature, and spectrum based on star composition.

Abstract

The possibility of observationally discriminating between various types of neutron stars, described by different equations of state of the nuclear matter, as well as differentiating neutron stars from other types of exotic objects, like, for example, quark stars, is one of the fundamental problems in contemporary astrophysics. We consider and investigate carefully the possibility that different types of rapidly rotating neutron stars, as well as other type of compact general relativistic objects, can be differentiated from the study of the emission properties of the accretion disks around them. We obtain the energy flux, the temperature distribution and the emission spectrum from the accretion disks around several classes of rapidly rotating neutron stars, described by different equations of state of the neutron matter, and for quark stars, described by the MIT bag model equation of state and in the CFL (Color-Flavor-Locked) phase, respectively. Particular signatures appear in the electromagnetic spectrum, thus leading to the possibility of directly testing the equation of state of the dense matter by using astrophysical observations of the emission spectra from accretion disks.