The planetary system Kepler-27 revisited

Abstract

Transit timing variations of planets in Kepler-27 were already reported in some papers, but the entire characterisation of them is still an open subject. Our main motivation for this paper is to investigate the dynamical behaviour of all planets and candidates in the systems. By using a MultiNest Bayesian inference tool, coupled to an efficient symplectic N-body integrator, we analyse the available TTV data of the objects in the system. We ran different configurations of planetary systems to compare them. We corroborate that Kepler-27b and Kepler-27c have actually properties of super-puffs planets, i.e., extremely low density planets with masses < 8 M⊕ and radii akin to those of giant planets (4 M⊕