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Isotopic ratios of ...
Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy)
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- Biver, N. (author)
- Observatoire de Paris-Meudon
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- Moreno, R. (author)
- Observatoire de Paris-Meudon
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- Bockelée-Morvan, D. (author)
- Observatoire de Paris-Meudon
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- Sandqvist, Aage (author)
- Stockholms universitet,Institutionen för astronomi
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- Colom, P. (author)
- Observatoire de Paris-Meudon
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- Crovisier, J. (author)
- Observatoire de Paris-Meudon
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- Lis, D. C. (author)
- Centre national de la recherche scientifique (CNRS)
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- Boissier, J. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Debout, V. (author)
- Observatoire de Paris-Meudon
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- Paubert, G. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Milam, S. (author)
- NASA Goddard Space Flight Center
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- Hjalmarson, Åke, 1939 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Lundin, S. (author)
- OHB AG Group
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- Karlsson, T. (author)
- OHB AG Group
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- Battelino, M. (author)
- OHB AG Group
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- Frisk, U. (author)
- Omnisys Instruments AB
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- Murtagh, Donal, 1959 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2016-04-15
- 2016
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 589, s. Art. no. A78-
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Abstract
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- The apparition of bright comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy) in March-April 2013 and January 2015, combined with the improved observational capabilities of submillimeter facilities, offered an opportunity to carry out sensitive compositional and isotopic studies of the volatiles in their coma. We observed comet Lovejoy with the IRAM 30 m telescope between 13 and 26 January 2015, and with the Odin submillimeter space observatory on 29 January-3 February 2015. We detected 22 molecules and several isotopologues. The (H2O)-O-16 and (H2O)-O-18 production rates measured with Odin follow a periodic pattern with a period of 0.94 days and an amplitude of similar to 25%. The inferred isotope ratios in comet Lovejoy are O-16/O-18 = 499 +/- 24 and D/H = 1.4 +/- 0.4 x 10(-4) in water, S-32/S-34 = 24.7 +/- 3.5 in CS, all compatible with terrestrial values. The ratio C-12/C-13 = 109 +/- 14 in HCN is marginally higher than terrestrial and N-14/N-15 = 145 +/- 12 in HCN is half the Earth ratio. Several upper limits for D/H or C-12/C-13 in other molecules are reported. From our observation of HDO in comet C/2014 Q2 (Lovejoy), we report the first D/H ratio in an Oort Cloud comet that is not larger than the terrestrial value. On the other hand, the observation of the same HDO line in the other Oort-cloud comet, C/2012 F6 (Lemmon), suggests a D/H value four times higher. Given the previous measurements of D/H in cometary water, this illustrates that a diversity in the D/H ratio and in the chemical composition, is present even within the same dynamical group of comets, suggesting that current dynamical groups contain comets formed at very different places or times in the early solar system.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- comets: individual: C/2012 F6 (Lemmon)
- comets: individual: C/2014 Q2 (Lovejoy)
- comets: general
- radio lines: planetary systems
- submillimeter: planetary systems
Publication and Content Type
- art (subject category)
- ref (subject category)
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Biver, N.
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Moreno, R.
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Bockelée-Morvan, ...
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Sandqvist, Aage
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Colom, P.
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Crovisier, J.
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show more...
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Lis, D. C.
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Boissier, J.
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Debout, V.
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Paubert, G.
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Milam, S.
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Hjalmarson, Åke, ...
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Lundin, S.
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Karlsson, T.
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Battelino, M.
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Frisk, U.
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Murtagh, Donal, ...
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Chalmers University of Technology
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Stockholm University