Reference : The CN isotopic ratios in comets
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/32796
The CN isotopic ratios in comets
English
Manfroid, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Jehin, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Cochran, A. [Department of Astronomy and McDonald Observatory, University of Texas at Austin, C-1400, Austin, USA]
Zucconi, J*-M [Observatoire de Besançon, 25010 Besançon Cedex, France]
Arpigny, Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Schulz, R. [ESA/RSSD, ESTEC, PO Box 299, NL-2200 AG Noordwijk, The Netherlands]
Stuewe [ > > ]
Ilyin, I. [AIP, An der Sternwarte 16, 14482 Potsdam, Germany]
1-Aug-2009
Astronomy and Astrophysics
EDP Sciences
503
613-624
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] comets: general ; techniques: spectroscopic ; line: identification ; line: profiles ; molecular processes
[en] Our aim is to determine the isotopic ratios [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N in a variety of comets and link these measurements to the formation and evolution of the solar system. The [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N isotopic ratios are measured for the CN radical by means of high-resolution optical spectra of the R branch of the B-X (0, 0) violet band. 23 comets from different dynamical classes have been observed, sometimes at various heliocentric and nucleocentric distances, in order to estimate possible variations of the isotopic ratios in parent molecules. The [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N isotopic ratios in CN are remarkably constant (average values of, respectively, 91.0 ± 3.6 and 147.8 ± 5.7) within our measurement errors, for all comets whatever their origin or heliocentric distance. While the carbon isotopic ratio does agree with the terrestrial value (89), the nitrogen ratio is a factor of two lower than the terrestrial value (272), indicating a fractionation in the early solar system, or in the protosolar nebula, common to all the comets of our sample. This points towards a common origin of the comets independently of their birthplaces, and a relationship between HCN and CN. Appendices and Table [see full textsee full textsee full text] are only available in electronic form at http://www.aanda.org Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programmes ID 268.C-5570, 270.C-5043, 073.C-0525, 274.C-5015 and 075.C-0355(A).
Researchers
http://hdl.handle.net/2268/32796
10.1051/0004-6361/200911859
http://cdsads.u-strasbg.fr/abs/2009A%26A...503..613M
http://de.arxiv.org/abs/0907.0311

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