Alternative LISA-TAIJI networks

The spaceborne gravitational wave (GW) detectors LISA and TAIJI are planned to be launched in the 2030s. The dual detectors with comparable sensitivities will form a network observing GWs with significant advantages. In this work, we investigate the three possible LISA-TAIJI networks for the different location and orientation compositions of the LISA orbit ($+60\ifmmode^\circ\else\textdegree\fi{}$ inclination and trailing the Earth by 20\ifmmode^\circ\else\textdegree\fi{}) and alternative TAIJI orbit configurations, including TAIJIp ($+60\ifmmode^\circ\else\textdegree\fi{}$ inclination and leading the Earth by 20\ifmmode^\circ\else\textdegree\fi{}), TAIJIc ($+60\ifmmode^\circ\else\textdegree\fi{}$ inclination and colocated with LISA), and TAIJIm ($\ensuremath{-}60\ifmmode^\circ\else\textdegree\fi{}$ inclination and leading the Earth by 20\ifmmode^\circ\else\textdegree\fi{}). Of the three LISA-TAIJI configurations, the LISA-TAIJIm network shows the best performance in the sky localization and polarization determination for massive binary systems due to its better complementary antenna pattern, and LISA-TAIJIc could achieve the best cross-correlation and observe the stochastic GW background with optimal sensitivity.