Prospecting for exo-Earths in multiple planet systems with a gas giant
Matthew T. Agnew, Sarah T. Maddison, Jonathan Horner

TL;DR
This study identifies promising exoplanet systems with gas giants where stable, detectable Earth-like planets could exist in the habitable zone, using numerical simulations and radial velocity predictions.
Contribution
It introduces a method to find stable, potentially habitable Earth-mass planets in systems with gas giants, considering complex gravitational interactions.
Findings
16 candidate systems identified for hosting stable exo-Earths
Secular resonances significantly influence habitable zone stability
Radial velocity signals of Earth-mass planets are detectable with ESPRESSO
Abstract
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…
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