Table 1 Summary of proposed exoplanet atmosphere technosignature gases including simulated in-transit observation times.
From: Fully fluorinated non-carbon compounds NF3 and SF6 as ideal technosignature gases
Technosignature gas | Planet type | Atmosphere type | Star type | JWST detectable abundance | Observation time |
|---|---|---|---|---|---|
CFC 14 (CF4) | Rocky-Earth-size | N2-dominated | White Dwarf | 10 × present Earth’s atm. abundance | 40.8 h28 |
CFC-11 (CCl3F) | Rocky-Earth-size | N2-dominated | White Dwarf | 10 × present Earth’s atm. abundance | 28.8 h28 |
CFC-11 (CCl3F) | Rocky-Earth-size | N2-dominated | M-dwarf | 0.225 ppb | 100–300 h12 |
CFC-12 (CCl2F2) | Rocky-Earth-size | N2-dominated | M-dwarf | 0.515 ppb | 100–300 h12 |
NO2 | Rocky-Earth-size | N2-dominated | M-dwarf | 20 × present Earth’s atm. abundance | *500 h32 |
NH3, N2O | Rocky-Earth-size | N2-dominated | G-dwarf | N/A | N/A33 |
