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Table 3

Maximum water content of TRAPPIST-1 b, c, and d, depending on the assumed core composition.

Core composition Maximum H2O mass fraction

T-1b T-1c T-1d
Pure silicate (MgSiO3) 0.4% 0.01% 0.01%
Terrestrial 2% 0.3% 0.08%
Pure iron >10% >10% 2%

Notes. Maximum water mass fractions were obtained by finding the corresponding mass-radius relationships that pass just above the 95% confidence ellipses from Grimm et al. (2018).

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