Table 3
Planet parameters, the XUV flux, and the equivalent width (EW) He(23S) absorption.
| Planet | HD 209458 b | HD 189733 b | GJ 3470 b | GJ 1214 b | WASP-69 b | WASP-76 b | HAT-P-32 b |
|---|---|---|---|---|---|---|---|
| Mass (MJup) |  |
 |
 |
 |
 |
 |
 |
| Radius (RJup) |  |
 |
 |
 |
 |
 |
 |
| Φ (ΦJup) (a) | 0.504 | 0.944 | 0.100 | 0.105 | 0.246 | 0.482 | 0.327 |
| Rlobe (RP) (b) | 4.2 | 4.2 | 5.8 | 4.52 | 4.1 | 2.12 | 2.14 |
| FXUV (c) | 2.4 | 25.4 | 3.7 | 0.64 | 23.2 | 145.6 | 417.4 |
| EW (mÅ) (d) | 5.3±0.5 | 12.7±0.4 | 20.7 ± 1.3 | 33.2 ± 3.8 | 28.3 ± 0.9 | 12.4 ± 1.7 | 114±4 |
| H/He | ≈98/2 | (99.2/0.8) ± 0.1 | ≈99.8/0.2 | ≳98/2 | – | - | ≈ 99/1 |
| Ṁ (×1011g s−1)(e) | 0.7 ± 0.3 | 1.4 ± 0.5 | 1.3±0.6 | 1.3 ± 1.1 | 0.9 ± 0.5 | 23.5 ± 21.5 | 130 ± 70 |
| T (K)(e) | 7600 ± 500 | 12700 ± 900 | 3400 ± 350 | 3750 ± 750 | 5250 ± 750 | 11500 ± 5500 | 12400 ± 2900 |
| η(e) | 0.15 ± 0.05 | 0.03 ± 0.01 | 0.115 ± 0.005 | 0.43 ± 0.03 | 0.02 ± 0.01 | 0.039 ± 0.036 | 0.017 ± 0.003 |
 |
1.0 | 0.04 | 1.58 | 1.80 | 0.45 | 0.33 | 1.44 |
| HER(g) | EL | RL | PL | PL | RL | RL | RL |
Notes. Data of HD 209458 b from Lampón et al. (2020) and references therein. Data for HD 189733 b and GJ 3470 b from this work, Lampón et al. (2021b) and references therein. (a)Gravitational potential in units of Jupiter’s potential. (b)Roche lobe calculated following Eggleton (1983). (c)XUV flux in units of 103 erg cm−2 s−1 at λ < 912 Å at planetary distance, calculated from Fig. 2.(d)EW integrated in the range 10831.0–10834.5 Å. (e)Ṁ, T, and η are calculated assuming a H/He = 98/2 for GJ 1214 b, WASP-69 b, and WASP-76 b. The range of η for HD 209458 b is assumed from Shematovich et al. (2014). (f)
is calculated for H/He = 98/2 in HD 209458 b, GJ 1214 b, WASP-69 b, and WASP-76 b; for H/He = 99/1 in HD 189733 b, and HAT-P-32 b; and for H/He = 99.8/2 in GJ 3470 b. (g)HER stands for hydrodynamic escape regime, where EL is energy-limited, RL recombination-limited, and PL photon-limited.
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