Periastron Advance in Neutron Star - Black Hole Binaries

TL;DR

This paper investigates the periastron advance in neutron star-black hole binaries using post-Newtonian formalism, highlighting the significance of first and second order effects and spin-orbit coupling for future observations.

Contribution

It provides a detailed analysis of periastron advance in neutron star-black hole binaries, emphasizing the importance of specific post-Newtonian effects and simplifying assumptions.

Findings

First and second order post-Newtonian effects are significant.

Spin-orbit coupling effects are important.

Higher order effects can be neglected.

Abstract

As neutron star - black hole binaries are expected to be discovered through future pulsar surveys using upcoming facilities, it is necessary to understand various observable properties of such systems. In the present work, we study the advance of the periastron of such binaries under the post-Newtonian formalism over a wide range of parameters. We find that the first and second order post-Newtonian effects and the leading order spin-orbit coupling effects are significant for such binaries but higher order effects can be neglected.