LISA observations of eccentric LIGO sources

Stellar-mass binary black holes are expected to have nearly circular orbits by the time they enter the LIGO band. Yet many years before merger, they will reside in the low-frequency band accessible to LISA, and may well retain significant eccentricity. We explore the statistical properties of such a population of sources, the expected signal-to-noise ratio of this population in LISA, and discuss the astrophysical implications of measuring non-zero eccentricity leading up to merger.