Joint gravitational wave detection by TianQin and LISA

TL;DR

This paper compares the detection capabilities of TianQin, LISA, and their joint operation for various gravitational wave sources, demonstrating that joint detection improves parameter estimation and detection constraints across multiple sources.

Contribution

It provides a comprehensive analysis of the detection accuracy for different gravitational wave sources using TianQin, LISA, and their joint operation, highlighting the benefits of combined detection.

Findings

Joint detection improves parameter constraints for most sources.

TianQin excels in detecting DWDs and light IMRIs.

LISA is more accurate for heavy IMRIs, EMRIs, and MBHBs.

Abstract

We study the detection accuracy of double white dwarfs (DWDs), stellar-mass black hole binaries (SBHBs), light and heavy intermediate mass ratio inspirals (IMRIs), extreme mass ratio inspirals (EMRIs), massive black hole binaries (MBHBs), and the stochastic gravitational wave background (SGWB) of astronomical origin for TianQin, LISA, and joint detection. We use a Fisher matrix analysis and consider for each source the averaged detection accuracy over a realistic range of parameters. We find that on average TianQin obtains more accurate parameter estimation for DWDs and light IMRIs, LISA for heavy IMRIs, EMRIs, MBHBs, and the galactic foreground of the SGWB, and both contribute similarly to the detection of SBHBs and the extra-galactic SGWB. Nevertheless, for all sources joint detection allows setting tighter constraints on most parameters highlighting its importance for future detection.