A New Concept for Spectro-photometry of Exoplanets with Space-based Telescopes

摘要: We propose a new concept for spectral characterization of transiting exoplanets with future space-based telescopes. This concept, called as densified pupil spectroscopy, allows us to perform high, stable spectrophotometry against telescope pointing jitter and deformation the primary mirror. spectrometer comprises following three roles: division into number sub-pupils, densification each sub-pupil, acquisition spectrum sub-pupil conventional spectrometer. Focusing on fact that divided can be treated point source, we discovered simplified acquire spectra sub-pupils detector plane-an optical conjugate mirror-by putting entrance slit The acquired multiple are not principally moved low-order aberrations such any reliability observation result is also increased by statistically treating them. Our numerical calculations show that, because this method suppresses instrumental systematic errors down 10 ppm under telescopes modest accuracy, next-generation space more than 2.5m diameter potentially provide opportunities characterize temperate super-Earths around nearby late-type stars through transmission spectroscopy secondary eclipse.