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Table 1

Adopted stellar and planetary characteristics of the Proxima system.

Parameter Value Unit

L 0.0017 L
Teff 3000 K
Age 4.8 Gyr

Mpsini 1.27 M
Mp 1.4 M
Rp 1.1 R
Semi-major axis 0.0485 AU
Sp 0.7 S
Spin-orbit resonance 1:1/3:2/2:1
Ωp 6.3 × 10-6/9.7 × 10-6/1.3 × 10-5 rad s-1
Stellar day /22.4/11.2 Earth days
Obliquity 0 °
Eccentricity 0

Surface types Rock/Liquid water/Ice
Thermal inertia 1000/20 000/2000 J m-2 K-1 s−½
Albedo 0.2/0.07/wavelength-dependant (Fig. 2)

Notes. We also show the adopted parameters for various GCM parametrizations. The values for the stellar and planetary parameters are derived from Anglada-Escudé et al. (2016).

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