Article (Scientific journals)
Toward a Unique Nitrogen Isotopic Ratio in Cometary Ices
Rousselot, Philippe; Pirali, Olivier; Jehin, Emmanuel et al.
2014In Astrophysical Journal. Letters, 780, p. 17, pp. 1-5
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Keywords :
comets: general; line: identification; molecular data; techniques: spectroscopic
Abstract :
[en] Determination of the nitrogen isotopic ratios in different bodies of the solar system provides important information regarding the solar system's origin. We unambiguously identified emission lines in comets due to the [SUP]15[/SUP]NH[SUB]2[/SUB] radical produced by the photodissociation of [SUP]15[/SUP]NH[SUB]3[/SUB]. Analysis of our data has permitted us to measure the [SUP]14[/SUP]N/[SUP]15[/SUP]N isotopic ratio in comets for a molecule carrying the amine (-NH) functional group. This ratio, within the error, appears similar to that measured in comets in the HCN molecule and the CN radical, and lower than the protosolar value, suggesting that N[SUB]2[/SUB] and NH[SUB]3[/SUB] result from the separation of nitrogen into two distinct reservoirs in the solar nebula. This ratio also appears similar to that measured in Titan's atmospheric N[SUB]2[/SUB], supporting the hypothesis that, if the latter is representative of its primordial value in NH[SUB]3[/SUB], these bodies were assembled from building blocks sharing a common formation location.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rousselot, Philippe;  Institut UTINAM-UMR CNRS 6213, Observatoire des Sciences de l'Univers THETA, University of Franche-Comté, BP 1615, F-25010 Besançon Cedex, France
Pirali, Olivier;  Synchrotron SOLEIL, ligne AILES, UMR 8214 CNRS, L'orme des Merisiers, Saint-Aubin, F-91192 Gif-Sur-Yvette, France
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Vervloet, Michel;  Synchrotron SOLEIL, ligne AILES, UMR 8214 CNRS, L'orme des Merisiers, Saint-Aubin, F-91192 Gif-Sur-Yvette, France
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Cordier, Daniel;  Institut UTINAM-UMR CNRS 6213, Observatoire des Sciences de l'Univers THETA, University of Franche-Comté, BP 1615, F-25010 Besançon Cedex, France
Martin-Drumel, Marie-Aline;  Synchrotron SOLEIL, ligne AILES, UMR 8214 CNRS, L'orme des Merisiers, Saint-Aubin, F-91192 Gif-Sur-Yvette, France
Gruet, Sébastien;  Synchrotron SOLEIL, ligne AILES, UMR 8214 CNRS, L'orme des Merisiers, Saint-Aubin, F-91192 Gif-Sur-Yvette, France
Arpigny, Claude ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Decock, Alice ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Mousis, Olivier;  Institut UTINAM-UMR CNRS 6213, Observatoire des Sciences de l'Univers THETA, University of Franche-Comté, BP 1615, F-25010 Besançon Cedex, France)
Language :
English
Title :
Toward a Unique Nitrogen Isotopic Ratio in Cometary Ices
Publication date :
01 January 2014
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
Institute of Physics Publishing, Bristol, United Kingdom
Volume :
780
Pages :
L17, pp. 1-5
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 January 2014

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