Interior characterisation in multi-planetary systems: TRAPPIST-1

We analyze the possible interiors of the Trappist-1 planets to better understand their formation and evolution. For this multiplanetary system, the available data are specific, i.e., there is a correlation of data between different planets (correlated masses) as well as for individual planets (planetary masses and radii). By using a probabilistic inference analysis, we formally take this correlation into account and quantify its importance for interior characterization. In addition, we compare the importance of data correlation with data precision. Finally, we show how variable the interiors of the Trappist-1 planets can be, e.g., in terms of water mass fractions and types of atmospheres.

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