An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ 436 b

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Table 4

Best-fit parameters and 1σ uncertainties derived from the fits to the Lyman-α line observations of GJ 436 b in Visits 2 and 3.

Parameter	Visit 2	Visit 3	Unit

Ṁ_H⁰	2.5	2.5	g s^-1
Γ_ion	2.2	2.4	s^-1
	50	60	km s^-1
	85	85	km s^-1
	1.2 ± 1.2 × 10⁴	1.2 ± 1.2 × 10⁴	K
	10 ± 10	10 ± 10	km s^-1
	1.3	3.3	cm^-3

χ²	203	182
d.o.f.	200	198

Notes. , Γ_ion, and Ṁ_H⁰ are given at the distance of the semi-major axis (a_p = 0.0287 au).

^(†)

The thermal velocity is calculated from the values obtained for the stellar wind kinetic temperature.

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