Abstract
Various techniques are being used to search for extra-solar planetary signatures, including accurate measurement of positional (astrometric) displacements, gravitational microlensing, and photometric transits. Planned space experiments promise a huge increase in the detections and statistical knowledge arising from transit and astrometric measurements. Direct detection of even nearby Earth-mass planets in the habitable zone and the measurement of their spectral characteristics, typified by the TPF and Darwin missions, represents a considerable challenge. Beyond TPF/Darwin, Life Finder would aim to produce confirmatory evidence of the presence of life, while an Earth ‘imager’, some massive interferometric array providing resolved images of a distant Earth, appears only as a distant vision. A 10 nano-arcsec astrometric mission would detect ‘Earths’ systematically out to 100 pc.
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Perryman, M. (2007). Detection and Characterization of Extra-Solar Planets: Future Space Missions. In: Lobanov, A.P., Zensus, J.A., Cesarsky, C., Diamond, P.J. (eds) Exploring the Cosmic Frontier. ESO Astrophysics Symposia European Southern Observatory. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39756-4_66
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