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Record 1 of 52446
Isotopic Ratios of Carbon and Oxygen in Titan's CO Using Alma
External Online Source: doi:10.3847/2041-8205/821/1/L8
Author and Affiliation:
Serigano, Joseph(Catholic Univ. of America, Dept. of Physics, Washington, DC, United States)
Nixon, C. A.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Cordiner, M. A.(Catholic Univ. of America, Dept. of Physics, Washington, DC, United States)
Irwin, P. G. J.(Oxford Univ., Atmospheric, Oceanic, and Planetary Physics, Clarendon Lab., Oxford, United Kingdom)
Teanby, N. A.(Bristol Univ., School of Earth Sciences, United Kingdom)
Charnley, S. B.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Lindberg, J. E.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Abstract: We report interferometric observations of carbon monoxide (CO) and its isotopologues in Titan's atmosphere using the Atacama Large Millimeter/submillimeter Array (ALMA). The following transitions were detected: CO (J = 1-0, 2-1, 3-2, 6-5), C-13 O (J = 2-1, 3-2, 6-5), C-18 O (J = 2-1, 3-2), and C-17 O (J = 3-2). Molecular abundances and the vertical atmospheric temperature profile were derived by modeling the observed emission line profiles using NEMESIS, a line-by-line radiative transfer code. We present the first spectroscopic detection of O-17 in the outer solar system with C-17 O detected at greater than 8 sigma confidence. The abundance of CO was determined to be 49.6 +/- 1.8 ppm, assumed to be constant with altitude, with isotopic ratios C-12/C-13 = 89.9 +/- 3.4, O-16/O-18 = 486 +/- 22, and O-16/O-17 = 2917 +/- 359. The measurements of C-12/C-13 and O-16/O-18 ratios are the most precise values obtained in Titan's atmospheric CO to date. Our results are in good agreement with previous studies and suggest no significant deviations from standard terrestrial isotopic ratios.
Publication Date: Apr 07, 2016
Document ID:
20170002452
(Acquired Mar 29, 2017)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Report/Patent Number: GSFC-E-DAA-TN40350
Document Type: Journal Article
Publication Information: Astrophysical Journal Letters (ISSN 2041-8205; e-ISSN 2041-8213); Volume 821; No. 1; L8
Publisher Information: IOP Publishing
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ISOTOPE RATIOS; TITAN ATMOSPHERE; CARBON; OXYGEN; CARBON MONOXIDE; MILLIMETER WAVES; SUBMILLIMETER WAVES; ATMOSPHERIC TEMPERATURE; SATELLITE ATMOSPHERES; INTERFEROMETRY; SPECTROSCOPY; SOLAR SYSTEM
Availability Source: Other Sources
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