Confirmation of the approximately 1340-day planet candidate around γ Leo A

Determine whether the approximately 1340-day planetary candidate orbiting γ Leo A is a genuine planet and establish its orbital and mass properties, which remain uncertain because the candidate has not been firmly detected.

Background

The paper discusses an additional planetary candidate around the red giant γ Leo A with a proposed orbital period of approximately 1340 days. Because the candidate lacks a firm detection, its estimated orbit and mass are imprecise. The authors exclude it from some simulations because it was ejected in every preliminary simulation, but they later test scenarios including the candidate and find that it never remains stable. Thus, the observational question of whether the signal corresponds to a real planet remains unresolved, independently of the dynamical evidence against its long-term stability.