The potential of multiband gravitational wave astronomy

We discuss the prospects of multiband gravitational wave science and some recent developments in multiband data analysis. A ground-based detector network has detected several stellar-mass black hole merger events, and many more detections are expected in the near future. A space-based detector such as LISA could observe the early inspiral of these systems. Multiband observations can improve our ability to determine source parameters by removing degeneracies, and possibly allow us to measure parameters (such as the orbital eccentricity) that may not be measurable on the ground. Space-based inspiral detections could allow us to forecast merger events observable from the ground; vice versa, by post-processing LISA data and exploiting coincidence with mergers observed on the ground we could be able to detect LISA inspirals that would otherwise be sub-threshold. We will quantify these possibilities and discuss some of their astrophysical implications.