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Table 1

XUV irradiation of TRAPPIST-1 planets.

FX FEUV FLyα Γion tot
(5100 Å) (100912 Å)

T-1b 1102 400 414 7.6 46
T-1c 588 213 221 4.1 14
T-1d 296 107 111 2.0 9
T-1e 171 62 64 1.2 6
T-1f 99 36 37 0.7 5
T-1g 67 24 25 0.5 2
T-1h 34 12 13 0.2

Notes. Fluxes in erg s-1 cm-2, hydrogen photoionization rate Γion in ×10-6 s-1, mass loss rate tot in 106 g s-1. X-ray flux is derived from Wheatley et al. (2017). The mass of TRAPPIST-1 h is unconstrained, and we did not estimate its mass-loss rate. Uncertainties on the EUV flux were estimated by accounting for both the uncertainty on the Ly-α flux and the Linsky et al. (2014) relation.

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