# Galactic binary science with the new LISA design

## TL;DR

This paper evaluates the scientific potential of a new LISA mission design, focusing on galactic binary detection and parameter estimation, based on updated sensitivity and noise estimates from the revised spacecraft configuration.

## Contribution

It provides updated estimates for galactic confusion noise, the number of resolvable binaries, and measurement accuracy using the new LISA design.

## Key findings

- Galactic confusion noise estimates are refined for the new design.
- Number of resolvable galactic binaries is projected based on the updated sensitivity.
- Parameter measurement accuracy for binaries is assessed with the new configuration.

## Abstract

Building on the great success of the LISA Pathfinder mission, the outlines of a new LISA mission design were laid out at the $11^{\rm th}$ International LISA Symposium in Zurich. The revised design calls for three identical spacecraft forming an equilateral triangle with 2.5 million kilometer sides, and two laser links per side delivering full polarization sensitivity. With the demonstrated Pathfinder performance for the disturbance reduction system, and a well studied design for the laser metrology, it is anticipated that the new mission will have a sensitivity very close to the original LISA design. This implies that the mid-band performance, between 0.5 mHz and 3 mHz, will be limited by unresolved signals from compact binaries in our galaxy. Here we use the new LISA design to compute updated estimates for the galactic confusion noise, the number of resolvable galactic binaries, and the accuracy to which key parameters of these systems can be measured.