Table B.1
Best targets for the metastable helium triplet at 10833 Å.
| Planet | Helium C [s−1/2 cm−1] | Observations published? |
|---|---|---|
| WASP-69 b | 2.73 × 10−2 | Detection |
| GJ 436 b | 2.25 × 10−2 | Nondetection |
| WASP-80 b | 1.98 × 10−2 | Nondetection |
| TOI-519 b | 1.86 × 10−2 | − |
| HAT-P-18 b | 1.33 × 10−2 | Detection |
| TOI-674 b | 1.25 × 10−2 | − |
| HAT-P-12 b | 1.21 × 10−2 | − |
| TOI-3235 b | 1.16 × 10−2 | − |
| WASP-52 b | 1.15 × 10−2 | Detection |
| HD 189733 b | 1.09 × 10−2 | Detection |
| TOI-1259 A b | 1.06 × 10−2 | Detection (Saidel et al. 2025) |
| TOI-3757 b | 9.62 × 10−3 | Nondetection |
| HAT-P-11 b | 9.15 × 10−3 | Detection |
| AU Mic b | 9.03 × 10−3 | Nondetection |
| NGTS-5 b | 8.86 × 10−3 | Nondetection |
| HATS-72 b | 8.78 × 10−3 | − |
| TOI-181 b | 7.72 × 10−3 | − |
| TOI-431 d | 7.56 × 10−3 | − |
| HAT-P-19 b | 7.17 × 10−3 | − |
| WASP-139 b | 7.09 × 10−3 | − |
| TOI-2134 b | 5.65 × 10−3 | Detection |
| LP 714-47 b | 5.05 × 10−3 | − |
| TOI-4010 c | 4.96 × 10−3 | − |
| WASP-160 B b | 4.90 × 10−3 | − |
| TOI-2525 b | 4.77 × 10−3 | − |
| WASP-156 b | 4.69 × 10−3 | − |
| TOI-269 b | 4.59 × 10−3 | − |
| Qatar-6 b | 4.49 × 10−3 | − |
| TOI-3629 b | 4.31 × 10−3 | − |
| TOI-1268 b | 4.21 × 10−3 | Detection |
| WASP-132 b | 4.09 × 10−3 | − |
| HATS-47 b | 3.95 × 10−3 | − |
| TOI-1694 b | 3.76 × 10−3 | − |
| HAT-P-17 b | 3.64 × 10−3 | − |
| TOI-5344 b | 3.43 × 10−3 | − |
| HATS-48 A b | 3.31 × 10−3 | − |
| TOI-5293 A b | 3.27 × 10−3 | − |
| TOI-532 b | 3.11 × 10−3 | − |
| HAT-P-68 b | 3.03 × 10−3 | − |
| TOI-3714 b | 2.96 × 10−3 | − |
Notes. The S/N pre-factor C is defined in Eq. B.9. WASP-107 b and a few other planets that have a high helium C in Fig. 7, are not in this table because they have potentially serious warnings described at the end of Sec. 2.5. See Orell-Miquel et al. (2024) for references on the observed planets, except for TOI 1259 A b which is not in their sample. The helium C-values of all planets can be found in the sunset database.1
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