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Table 1

Properties of GJ 436 and its planet.

Parameter Value Ref.

The planet
Mass Mp (M) 23.17 ± 0.79 (1)
Radius Rp (R) (1)
Mean density ρp (g cm-3) (1)
Gravity gp (m s-2) 12.8 ± 0.8 (1)
Semi-major axis ap (au) 0.02872 ± 0.00027 (1)
Brightness temperature TB (K) 717 ± 35 (3)

The star
Distance d (pc) 10.23 ± 0.24 (4)
X/EUV luminosity
log (LX/EUV    [erg   s-1]) (2)

References. (1) Torres (2007); (2) Hünsch et al. (1999), Sanz-Forcada et al. (2010), Poppenhaeger et al. (2010); (3) Demory et al. (2007); (4) Hipparcos catalogue, Perryman et al. (1997).

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