Detection of planetary systems and the search for evidence of life

Details Detection of planetary systems and the search for evidence of life Detection of planetary systems and the search for evidence of life

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..340b&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, July 24, 1986, p. 340, 341.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Extrasolar Planets, Extraterrestrial Life, Optical Measurement, Planetary Systems, Radio Astronomy, Interferometry, Oxygen Spectra, Spectral Bands

Scientific paper

The use of combined radioastronomy and optical methods to obtain images of earthlike planets orbiting nearby stars is discussed, and the use of spectroscopy to study their atmospheres for evidence of life is addressed. The general system requirements for a star of given distance and flux are described, and the characteristics of a radar aperture synthesis system that could detect an earthlike planet orbiting the G5 star Tau Ceti, roughly 3 pc distant, are given. A spectroscopic integration time of about 100 h could be used to detect atmospheric ozone and SO2, and possibly the oxygen A-band. Several objections to these points are discussed.

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