Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage

SEKIYA Minoru, HAYASHI Chushiro, NAKAZAWA Kiyoshi, of Physics Kyoto University Department, of Physics Kyoto University Department, of Physics Kyoto University Department

Research output: Contribution to journalArticle

Abstract

If the Earth was formed in a stage before the gas of a solar nebula was dissipated, it was surrounded by a dense primitive atmosphere with the solar chemical composition. The atmosphere was gravitationally bound to the Earth after the solar nebula was dissipated by strong solar wind in a T Tauri stage. We calculate numerically the escape of this atmosphere due to heating by strong solar radiation, especially by far-UV radiation absorbed through photodissociation of water molecules. We assume that the flow of the atmospheric gas is spherically-symmetric and steady. The results show that the efficiency of mass loss by the far-UV radiation is very large compared with the case of EUV radiation, which was studied previously, and that the atmosphere was wholly dissipated within 2×10^7y, i.e., a typical period of the T Tauri stage, if the far-UV flux was more than 1×10^2 times as large as the present value. This flux is well expected from observations of T Tauri stars. The effect of solar wind is found to be unimportant.
Original languageEnglish
Pages (from-to)1301-1316
Number of pages16
JournalProgress of Theoretical Physics
Volume66
Issue number4
DOIs
Publication statusPublished - Oct 25 1981
Externally publishedYes

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dissipation
atmospheres
solar nebula
solar wind
radiation
T Tauri stars
solar radiation
gases
photodissociation
escape
chemical composition
heating
water
molecules

Cite this

Minoru, SEKIYA., Chushiro, HAYASHI., Kiyoshi, NAKAZAWA., Department, O. P. K. U., Department, O. P. K. U., & Department, O. P. K. U. (1981). Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage. Progress of Theoretical Physics, 66(4), 1301-1316. https://doi.org/10.1143/PTP.66.1301

Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage. / Minoru, SEKIYA; Chushiro, HAYASHI; Kiyoshi, NAKAZAWA; Department, of Physics Kyoto University; Department, of Physics Kyoto University; Department, of Physics Kyoto University.

In: Progress of Theoretical Physics, Vol. 66, No. 4, 25.10.1981, p. 1301-1316.

Research output: Contribution to journalArticle

Minoru, SEKIYA, Chushiro, HAYASHI, Kiyoshi, NAKAZAWA, Department, OPKU, Department, OPKU & Department, OPKU 1981, 'Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage', Progress of Theoretical Physics, vol. 66, no. 4, pp. 1301-1316. https://doi.org/10.1143/PTP.66.1301
Minoru SEKIYA, Chushiro HAYASHI, Kiyoshi NAKAZAWA, Department OPKU, Department OPKU, Department OPKU. Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage. Progress of Theoretical Physics. 1981 Oct 25;66(4):1301-1316. https://doi.org/10.1143/PTP.66.1301
Minoru, SEKIYA ; Chushiro, HAYASHI ; Kiyoshi, NAKAZAWA ; Department, of Physics Kyoto University ; Department, of Physics Kyoto University ; Department, of Physics Kyoto University. / Dissipation of the Primordial Terrestrial Atmosphere Due to lrradiation of the Solar Far-UV during T Tauri Stage. In: Progress of Theoretical Physics. 1981 ; Vol. 66, No. 4. pp. 1301-1316.
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