Table 3
Planet parameters, the XUV flux, and EW(He(23S)) absorption.
| Planet | HD 209458 b | HD 189733 b | GJ 3470 b |
|---|---|---|---|
| Mass (MJup) | 0.685  |
1.162  |
0.036  |
| Radius (RJup) | 1.359  |
1.23  |
0.36  |
| Gravity (gJup) | 0.371 | 0.768 | 0.278 |
| Φ (a) (ΦJup) | 0.504 | 0.944 | 0.100 |
| Rlobe (RP)(b) | 4.2 | 3.0 | 3.6 |
| FXUV (c) | 2.358 | 56.74 | 3.928 |
| EW (mÅ)(d) | 5.3 ± 0.5 | 12.7 ± 0.4 | 20.7 ± 1.3 |
Notes. Planetary mass and radius of HD 209458 b from Torres et al. (2008). Those of HD 189733 b and GJ 3470b are taken from Table 1 and included here for easier comparisons. (a) Gravitational potential. (b)Roche lobe of HD 209458 b, HD 189733 b, and GJ 3470 b by Salz et al. (2016), Eggleton (1983), and Bourrier et al. (2018), respectively. (c) XUV flux in units of 103 erg cm−2 s−1 at λ < 912 Å at planetary distance, calculated from Lampón et al. (2020) for HD 209458 b and from Fig. 2 for HD 189733 b and GJ 3470 b. (d) Equivalent width (EW) integrated in the range of 10 831.0−10 834.5 Å.
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