Determination of habitable zones in extrasolar planetary systems:: Where are Gaia's sisters?

被引:53
作者
Franck, S
von Bloh, W
Bounama, C
Steffen, M
Schönberner, D
Schellnhuber, HJ
机构
[1] Potsdam Inst Climate Impact Res, D-14412 Potsdam, Germany
[2] Astrophys Inst Potsdam, D-14482 Potsdam, Germany
关键词
D O I
10.1029/1999JE001169
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A general modeling scheme for assessing the suitability for lift of extrasolar planets is presented. The scheme focuses on the identification of the "habitable zone" in main sequence star planetary systems accommodating Earth-like components. Our definition of habitability is based on the long-term possibility of photosynthetic biomass production under geodynamic conditions. Therefore all the pertinent astrophysical, climatological, biogeochemical, and geodynamic processes involved in the generation of photosynthesis-driven life conditions are taken into account. Implicitly, a cogenetic origin of the central star and the orbiting planet is assumed. A geostatic model version is developed and investigated in parallel for demonstration purposes. The numerical solution of the advanced geodynamic model yields realistic lookup diagrams for convenient habitability determination. As an illustration, the MACHO-98-BLG-35 event is scrutinized. It is shown that this event is definitely not tantamount to the discovery of one of Gaia's sisters.
引用
收藏
页码:1651 / 1658
页数:8
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