Primary and secondary eclipse spectroscopy with JWST exploring the exoplanet parameter space

摘要: Eclipse exoplanet spectroscopy has yielded detection of H_2O, CH_4, CO_2 and CO in the atmosphere hot jupiters neptunes. About 40 large terrestrial planets are announced or confirmed, two which transiting, another deemed habitable. Hence potential for eclipse with James Webb Space Telescope (JWST) become an active field study. We explore parameter space (type stars, planet orbital periods types, instruments/wavelengths) terms signal-to-noise ratio (S/N) achievable on spectroscopic features. use analytic formula model data both astrophysical scene instrument, to plot S/N contour maps, while indicating how scales fixed parameters. systematically compare stellar photon noise-only figures ones including detailed instrumental zodiacal noises. Likelihood occurring targets is based catalog star population solar neighborhood. The 9.6 micron ozone band detectable (S/N = 3) JWST, a warm super-earth 6.7 pc away, using ~2% 5-year nominal mission time (summing observations, M4V lighter host primary eclipses, M5V secondary). If every up this mass limit distance were habitable planet, there should be statistically ~1 eclipsing case. Investigation systematic noises co-addition 5 years worth-, tens days separated-, hours-long observations critical, complemented by dedicated characterisation instruments, currently integration phase. census nearby transiting must complete before beginning science operations.