  In this work, we hunt for the best places to find exo-Earths in the currently
known exoplanet population. While it is still unclear whether Jupiter had a
beneficial or detrimental effect on the creation of the right environment for a
habitable Earth to develop, we focus on the 51 multiple planet systems that
have at least one Jupiter-like planet and aim to identify which would be good
candidates to host an exo-Earth. We conduct a series of numerical simulations
to identify dynamically stable regions of the habitable zone of the multiple
exoplanet systems capable of hosting an Earth-mass planet. We produce a
candidate list of 16 systems that could host such a stable exo-Earth in their
habitable zone, and for which the induced radial velocity signal of a
hypothetical one, two or four Earth-mass planet on the host star would be
detectable with the ESPRESSO spectrograph. We find that whilst the
gravitational interactions with the massive planet nearest the habitable zone
are critical in determining stability, the secular resonant interactions
between multiple planets can also have a dramatic influence on the overall
stability of the habitable zone.
