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The recent discovery of multiple planets in the circumbinary systemTOI-1338/BEBOP-1 raises questions about how such a system formed. The formationof the system was briefly explored in the discovery paper, but only to answerthe question do current pebble accretion models have the potential to explainthe origin of the system? We use a global model of circumbinary planetformation that utilises N-body simulations, including prescriptions for planetmigration, gas and pebble accretion, and interactions with a circumbinary disc,to explore the disc parameters that could have led to the formation of theTOI-1338/BEBOP-1 system. With the disc lifetime being the main factor indetermining how planets form, we limit our parameter space to those thatdetermine the disc lifetime. These are: the strength of turbulence in the disc,the initial disc mass, and the strength of the external radiation field thatlaunches photoevaporative winds. When comparing the simulated systems toTOI-1338/BEBOP-1, we find that only discs with low levels of turbulence areable to produce similar systems. The radiation environment has a large effecton the types of planetary systems that form, whilst the initial disc mass onlyhas limited impact since the majority of planetary growth occurs early in thedisc lifetime. With the most TOI-1338/BEBOP-1 like systems all occupyingsimilar regions of parameter space, our study shows that observed circumbinaryplanetary systems can potentially constrain the properties of planet formingdiscs.

Constraining the formation history of the TOI-1338/BEBOP-1 circumbinary planetary system