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Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9113h&link_type=abstract
HST Proposal ID #9113
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Hst Proposal Id #9113 Cold Stars
Scientific paper
Prior to 3.5 Gyr ago when life arose on Earth, the ultraviolet emission of the early Sun was more intense than at present. This radiation helped shape the chemical environment of the early Earth and hence influenced prebiotic evolution, the origin of life, and its subsequent early development. We propose to investigate this UV emission by making an efficient, systematic study of the UV spectra of 8 stars believed to resemble the early Sun. beginitemize em We will use the observed UV flux distributions as boundary conditions in photochemical models of the Earth's atmosphere, in order to estimate the concentrations of greenhouse gases and other molecules that may have played a major role in the origin of life. em We will also use the spectra to construct semi- empirical models of the chromospheres of these young solar analogs. The chromospheric models will enable us to predict the extreme-UV emission of the early Sun and its consequences for the erosion of the early Earth's atmosphere and the altered oxidation state of the planet. em We will investigate the effect of metallicity on the UV emission and its consequences for the photochemistry of Earth-like planets. enditemize
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