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      Intra-system uniformity: a natural outcome of dynamical sculpting

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          ABSTRACT

          There is evidence that exoplanet systems display intra-system uniformity in mass, radius, and orbital spacing (like ‘peas in a pod’) when compared with the system-to-system variations of planetary systems. This has been interpreted as the outcome of the early stages of planet formation, indicative of a picture in which planets form at characteristic mass scales with uniform separations. In this paper, we argue instead that intra-system uniformity in planet sizes and orbital spacings likely arose from the dynamical sculpting of initially overly packed planetary systems (in other words, the giant impact phase). With a suite of N-body simulations, we demonstrate that systems with random initial masses and compact planet spacings naturally develop intra-system uniformity, in quantitative agreement with observations, due to collisions between planets. Our results suggest that the pre-giant impact planet mass distribution is fairly wide and provide evidence for the prevalence of dynamical sculpting in shaping the observed population of exoplanets.

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          Most cited references49

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          Photoevaporation of protoplanetary discs – II. Evolutionary models and observable properties

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            The Stability of Multi-Planet Systems

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              REBOUND: an open-source multi-purposeN-body code for collisional dynamics

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                Author and article information

                Contributors
                Journal
                Monthly Notices of the Royal Astronomical Society: Letters
                Oxford University Press (OUP)
                1745-3925
                1745-3933
                October 2023
                July 04 2023
                October 2023
                July 04 2023
                July 05 2023
                : 525
                : 1
                : L66-L71
                Article
                10.1093/mnrasl/slad092
                d81d6d28-3b00-43cb-bff5-2cef3e40da3c
                © 2023

                https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model

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