地球型惑星の大気形成と生命の存在する惑星

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(161) MF%dῌZ4e. ῎῍῏ῌ 1) ¡¢ £ ¤῕¥¦ῒ 1997, §¨©ª12῔ «r 12 ¬῔ r ® 3 ¯ 2) °± ² 1998, §¨©ª12῔ «r 13 12³q ΐ ® 1 ¯ 3) Sasaki S., 1990, in Origin of the Earth, p. 195 4) Lange M. A., Ahrens T. J., 1982, Icarus 51, 96 5) Kuramoto K., Matsui T., 1996, J. Geophys. Res. 101, 14909 6) Kimura K., et al., 1974, Geochim. Cosmoshim. Acta 38, 683 7) Hashimoto G. L., Abe Y., Sugita S., 2004, in preparation 8) Sekiya M., et al., 1981, Prog. Theor. Phys. 66, 1301 9) Melosh H. J., Vickery A. M., 1989, Nature 338, 487 10) Genda H., Abe Y., 2003, Icarus 164, 149 11) Sekine Y., et al., 2003, J. Geophys. Res. 108(E7), 5070 12) )l´µ´ 2004, ¶·῔ «r¸¹5῍ º 13, 4. ῏ WFL%& f)%* ῔ g ! WF8ῌZ4῔. hiWFj. k4Tlm 8EnF ?8)ljk4T῔. 3! WF. %op!>%* \]qrs Ltu?@v8d 12w῔. +A$%῔. %8. 9<῎BC UV) WF%LvE %* \]xyz{|}~K q) n| !>%8912) qr !lnF@| WF%* 12!῔. %῎. 8$"#)%& D E% &F@῔. !l"#)8,-. >%mL* +A$%῔. %. 89:;I.+A!J%l WF@?@ \]qrs mp v+A$%῔. $&. !J g12w῔ $῔. . Formation of Atmospheres on Terrestrial Planets George L. HASHIMOTO Laboratory for Atmosphere-Hydrosphere Sciences, Department of Earth and Planetary System Sciences, Kobe University, 1ῌ1 Rokkodai, Nada, Kobe 657ῌ8501, Japan Abstract : Atmospheres of terrestrial planets are generated by a gravitational capture of protoplanetary disk gas and impact degassing of accreting materials. The composition of atmosphere is closely related to the composition of accreting material, but it is also a#ected by chemical reaction between atmosphere and solid planet and atmospheric loss processes. Our calculation demonstrates that the early atmosphere of terrestrial planets would contain a significant amount of reduced species and H2O. Since such an environment satisfies the conditions for harboring a life in view of the chemistry, there would be lots of planets that harbors a life.. %!?DE@F%. !>%* ® 98 ». ®1¼. 13.

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