Mathematics – Logic
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.514..277k&link_type=abstract
In: Earth-like planets and moons. Proceedings of the 36th ESLAB Symposium, 3 - 8 June 2002, ESTEC, Noordwijk, The Netherlands. E
Mathematics
Logic
1
Earth: Life, Planets: Life
Scientific paper
The detection of O2 or its product O3 is our most reliable biomarker so far. The existence of H2O in liquid state on the surface of a planet is considered essential for the development of life; even so, it is not a bioindicator. CO2 indicates an atmosphere, and abundant CH4 can indicate biological sources, although depending on the degree of oxidation of a planet's crust and upper mantle non-biological sources could also produce large amounts of CH4. In the thermal part of the spectrum, the shape gives a measure of the temperature of the object examined. The mid-IR spectra can determine the planet's albedo, the temperature of the observable emitting regions and thus the planet's size. Visible to near-IR spectra offer higher spatial resolution for the same collecting area, are minimally affected by temperature and therefore able to determine the abundance of atmospheric species. However the visible/near-IR continuum does not give direct indication of the planet size because of the possible albedo range.
Fridlund Malcolm
Kaltenegger Lisa
Kasting James
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