Infrared Observations of Planetary Atmospheres

摘要: Infrared spectra of planetary atmospheres show a large variety features. They are dominated by the signatures their most spectroscopically active constituents: CO2 in case terrestrial planets, and CH4 giant planets. Minor species also detectable, particular: CO H2O planets with, addition, O3 Earth atmosphere; NH3 PH3 Jupiter Saturn; several hydrocarbons all Titan. In order to search for spectral exoplanets, 6–15 µm range is especially appropriate. Assuming that sources noise (apart from detector noise) can be completely removed, required integration time detecting an Earth-like planet at 5 parsec (assuming performances ISO detectors) about two weeks 5-m telescope (R=100, S/N=5). Improving sensitivity detectors would reduce these times accordingly.