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Chemistry at Titan, the enigmatic moon of Saturn

등록일
2005년 8월 29일 14시 26분 00초
접수번호
1022
발표코드
금8B5심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 16시 : 30분
발표형식
심포지엄
발표분야
물리화학 - 외계의 화학종 (Chemical Species in Outer Space)
저자 및
공동저자
Patricia M. Beauchamp
Life Detection Science and Technology Program office, Jet Propulsion Laboratory, U.S.A.,
Titan, a natural satellite of Saturn, has been shrouded in mystery since its discovery by Christian Huygens in 1655. Titan’s surface was hidden from Voyagers 1 and 2, but the Cassini/Huygens data has begun to reveal some details. Titan’s atmosphere is a classical greenhouse troposphere overlain by a stratosphere consisting of mostly molecular nitrogen, with an admixture (2-10%) methane. Methane is condensed out in the troposphere by low temperature (95 K surface, 70 K @ 50 km), while it is photolytically converted to higher hydrocarbons in the stratosphere by ultraviolet photons from the Sun. Previous modeling had inferred an ethane-methane ocean on Titan, but so far, no liquid has been observed on the surface. However, it still appears that organics must be present on the surface and a source of methane must also be there. Understanding the generation of the organic molecules and the fate they undergo is key to understanding the chemistry on Titan. Cassini data will help elucidate this chemistry.

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