Investigating galactic double white dwarfs for sub-milliHz gravitational wave mission ASTROD-GW

Understand

A large number of galactic binary systems emit gravitational waves (GW) continuously with frequencies below $\sim$10 mHz.

• The LISA mission could identify tens of thousands of binaries over years of observation and will be subject to the confusion noise around 1 mHz yielded by the unresolved sources.
• Beyond LISA, there are several missions have been proposed to observe GWs in the sub-mHz range where the galactic foreground is expected to be overwhelming the instrumental noises.
• In this study, we investigate the detectability of sub-mHz GW missions to detect the galactic double white dwarf (DWD) binaries and evaluate the confusion noise produced by the undistinguished DWDs.