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Volumn 308, Issue 5724, 2005, Pages 982-986

Ion Neutral Mass Spectrometer results from the first flyby of Titan

(22)  Waite Jr , J Hunter a   Niemann, Hasso b   Yelle, Roger V c   Kasprzak, Wayne T b   Cravens, Thomas E d   Luhmann, Janet G e   McNutt, Ralph L f   Ip, Wing Huen g   Gell, David a   De La Haye, Virginie a   Müller Wordag, Ingo h   Magee, Brian a   Borggren, Nathan c   Ledvina, Steve e   Fletcher, Greg a   Walter, Erin a   Miller, Ryan a   Scherer, Stefan a   Thorpe, Rob i   Xu, Jing a   more..


Author keywords

[No Author keywords available]

Indexed keywords

ARGON; ATMOSPHERIC COMPOSITION; COMPOSITION; EXTRATERRESTRIAL ATMOSPHERES; HYDROGEN; ISOTOPES; MASS SPECTROMETERS; METHANATION; NITROGEN;

EID: 20844448220     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1110652     Document Type: Article
Times cited : (393)

References (35)
  • 7
    • 18644374524 scopus 로고    scopus 로고
    • note
    • Lower atmosphere values of the hydrocarbon mixing ratios at a pressure of 1.5 to 3.0 mbar and a latitude of 39° were taken from Flaser et al. (28). The methane value comes from the same reference but at a pressure of 3 to 20 mbar.
  • 9
    • 18644381969 scopus 로고    scopus 로고
    • note
    • If instead of the solar wind value, we choose initial values close to the newly determined protonebula value (430), determined by Owen et al. (29), the requirement for escape is much larger than our assumption of a terrestrial initial value of 272.
  • 13
    • 0031093720 scopus 로고    scopus 로고
    • T. Hidayat et al., Icarus 126, 170 (1997).
    • (1997) Icarus , vol.126 , pp. 170
    • Hidayat, T.1
  • 14
    • 18644378532 scopus 로고    scopus 로고
    • note
    • 15N is the photoinduced isotopic fractionation effect (PHIFE) proposed by Yung and Miller (30). However, a preliminary estimate by Yung (31) shows that the magnitude of PHIFE for HCN is not sufficient to account for the observed enrichment.
  • 15
    • 18644380340 scopus 로고    scopus 로고
    • note
    • Another possibility is ion-neutral reactions as studied in the case of the interstellar medium by R. Terzieva and E. Herbst (32), but such effects have not been examined at Titan temperatures (150 K).
  • 17
    • 18644371507 scopus 로고    scopus 로고
    • note
    • 2O on Earth (33).
  • 18
    • 18644386326 scopus 로고    scopus 로고
    • personal communication
    • 40Ar. Perhaps we shouldn't be surprised by the very low degassing efficiency. If we assume that Titan has a rock core and that core was volcanically active, those magmas would still be erupting at great depths, and at pressures around 2 GPa. There is no thermodynamic incentive for volcanics to degas at such pressures.
    • McKinnon, W.B.1
  • 24
    • 18644363193 scopus 로고    scopus 로고
    • O. Mousis et al., Icarus 156, 167 (2002).
    • (2002) Icarus , vol.156 , pp. 167
    • Mousis, O.1
  • 26
    • 0024280538 scopus 로고
    • C. P. McKay et al., Nature 332, 520 (1988).
    • (1988) Nature , vol.332 , pp. 520
    • McKay, C.P.1
  • 28
    • 20844450913 scopus 로고    scopus 로고
    • F. M. Flasar et al., Science 308, 975 (2005).
    • (2005) Science , vol.308 , pp. 975
    • Flasar, F.M.1
  • 31
    • 18644364358 scopus 로고    scopus 로고
    • personal communication
    • Y. L. Yung, personal communication.
    • Yung, Y.L.1
  • 35
    • 18644386204 scopus 로고    scopus 로고
    • note
    • We thank the Cassini project at NASA/Jet Propulsion Laboratory for financial support through contract #1228303; the flight and instrument teams for many years of dedicated effort; the Cassini Interdisciplinary Scientists T. Owens, D. Gautier, and J. Lunine for many helpful discussions; and several members of the Space Science community, K. Freeman, J. Kasting, R. Dissly, Y. Yung, and W. McKinnon for additional discussions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.