A critical assessment of the applicability of the energy-limited approximation for estimating exoplanetary mass-loss rates

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Table 4

System parameters and atmospheric physical conditions derived from the energy-limited approach of two planets with almost identical Λ values and Ṁ_ζ-to-Ṁ_hc mass-loss ratios (close to 1).

Subsonic	M_pl	R_pl	T_eq	Φ_XUV	Λ	r_XUV	Ṁ_ζ	Ṁ_hc	T_XUV	T_limit
condition	[M_⊕]	[R_⊕]	[K]	[J m⁻² s⁻¹]		[R_pl]	[kg s⁻¹]	[kg s⁻¹]	[K]	[K]
Met	19	5	1000	2.9	24.8	1.11	8.3 × 10⁶	8.7 × 10⁶	11 190	16,570
Not met	13	4	900	39.5	24.5	1.03	7.0 × 10⁷	7.4 × 10⁷	10 683	115

Notes. The heavier planet complies with the subsonic condition, namely the condition for which the XUV absorption radius lies below the sonic point, while the lighter planet does not.

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