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The TRAPPIST-1 system provides an exquisite laboratory for understandingexoplanetary atmospheres and interiors. Their mutual gravitational interactionsleads to transit timing variations, from which Grimm et al. (2018) recentlymeasured the planetary masses with precisions ranging from 5% to 12%. Usingthese masses and the <5% radius measurements on each planet, we apply themethod described in Suissa et al. (2018) to infer the minimum and maximum CRF(core radius fraction) of each planet. Further, we modify the maximum limit toaccount for the fact that a light volatile envelope is excluded for planets bthrough f. Only planet e is found to have a significant probability of having anon-zero minimum CRF, with a 0.7% false-alarm probability it has no core. Ourmethod further allows us to measure the CRF of planet e to be greater than (49+/- 7)% but less than (72 +/- 2)%, which is compatible with that of the Earth.TRAPPIST-1e therefore possess a large iron core similar to the Earth, inaddition to being Earth-sized and located in the temperature zone.

TRAPPIST-1e Has a Large Iron Core