The habitable zone of Earth-mass planets around 47 UMa: results for land and water worlds

Details The habitable zone of Earth-mass planets around 47 UMa: results for land and water worlds The habitable zone of Earth-mass planets around 47 UMa: results for land and water worlds

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ijasb...2...35f&link_type=abstract

International Journal of Astrobiology, vol. 2, Issue 01, p.35-39

Biology

11

Extrasolar Planets, Geodynamics, Habitable Zone, Orbital Stability And Planetary Climate

Scientific paper

In a previous paper, we showed that Earth-type habitable planets around 47 UMa are in principle possible if a distinct set of conditions is warranted. These conditions include that the Earth-type planets have successfully formed and are orbitally stable and, in addition, that the 47 UMa star-planet system is relatively young ([less, similar]6 Gyr). We now extend this study by considering Earth-like planets with different land/ocean coverages. This study is again based on the so-called integrated system approach, which describes the photosynthetic biomass production taking into account a variety of climatological, biogeochemical and geodynamical processes. This approach implies a special characterization of the habitable zone defined for a distinct type of planet. We show that the likelihood of finding a habitable Earth-like planet on a stable orbit around 47 UMa critically depends on the percentage of the planetary land/ocean coverage. The likelihood is significantly increased for planets with a very high percentage of ocean surface ("water worlds").

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