HST/STIS Lyman-α observations of the quiet M dwarf GJ 436 - Predictions for the exospheric transit signature of the hot Neptune GJ 436b

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Table 1

Properties of GJ 436 and its planet.

Parameter	Value	Ref.

The planet
Mass M_p (M_⊕)	23.17 ± 0.79	(1)
Radius R_p (R_⊕)		(1)
Mean density ρ_p (g cm^-3)		(1)
Gravity g_p (m s^-2)	12.8 ± 0.8	(1)
Semi-major axis a_p (au)	0.02872 ± 0.00027	(1)
Brightness temperature T_B (K)	717 ± 35	(3)

The star
Distance d_⋆ (pc)	10.23 ± 0.24	(4)
X/EUV luminosity
log (L_X/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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