Self-consistent modeling of metastable helium exoplanet transits

Open Access

Table 1

Best-fitting coefficients for the He I(2³S) photoionization cross section.

Energy interval [eV]	log₁₀(σ₀[cm²])	k
4.8–7.5	0.6859	−0.8134
7.5–35.0	0.8710	−1.7720
35.0–46.0	−8.4719	9.1038
46.0–60.0	3.3997	−3.0390

Notes. A sequence of cojoined power-laws of the form is assumed over different energy ranges above the helium ionization energy of 4.8 eV; the cross section has units of 10⁻¹⁸ cm².

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