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Presentation #608.07 in the session Multiple-Planet Systems.

Published onApr 03, 2024

Extrasolar multiple-planet systems play a vital role in understanding the formation history of the Solar System and planetary formation and evolution in general. The EXO-RESTART (EXOplanetary dynamics and stability: Reverse Engineering of STable multiplanetary ARchitecTures) project at Sofia University, Bulgaria, aims to re-analyze the observed statistical and physical characteristics of all literature and newly discovered multi-planet systems in a homogeneous manner. Biases in characterization techniques, such as the use of multi-Keplerian models that do not account for planetary dynamics, or the application of inconsistent stability criteria to these systems, are hampering theoretical advancements in the field. Crucial for probing planet formation are the dynamical properties of the systems, such as the osculating orbital parameters, as opposed to the Keplerian best-fit parameters found in the literature. The EXO-RESTART project strives to overcome these biases and study planetary formation and evolution by applying state-of-the-art numerical techniques. The immediate objective is to perform the first homogeneous dynamical modeling of high-precision Doppler and transit photometry data consistent with multiple-planet systems. This modeling will be accompanied by extensive long-term stability analysis to reveal the current dynamical architecture. The ultimate goal of EXO-RESTART is to conduct planet migration and planet-planet scattering simulations, thereby probing the formation mechanisms of high-order mean motion resonance (MMR) systems, eccentric multiple-planet systems, and circumprimary planets in close binary systems, which are currently poorly studied. These analyses are expected to unveil the primordial planet-disk conditions necessary to assemble the observed planetary architectures.

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