Article (Scientific journals)
New constraints on the delivery of cometary water and nitrogen to Earth from the 15N/14N isotopic ratio
Hutsemekers, Damien; Manfroid, Jean; Jehin, Emmanuel et al.
2009In Icarus, 204, p. 346-348
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Abstract :
[en] New independent constraints on the amount of water delivered to Earth by comets are derived using the [SUP]15[/SUP]N/[SUP]14[/SUP]N isotopic ratio, measured to be roughly twice as high in cometary CN and HCN as in the present Earth. Under reasonable assumptions, we find that no more than a few percent of Earthâ s water can be attributed to comets, in agreement with the constraints derived from D/H. Our results also suggest that a significant part of Earthâ s atmospheric nitrogen might come from comets. Since the [SUP]15[/SUP]N/[SUP]14[/SUP]N isotopic ratio is not different in Oort-cloud and Kuiper-belt comets, our estimates apply to the contribution of both types of objects.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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)
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Arpigny, Claude ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
New constraints on the delivery of cometary water and nitrogen to Earth from the 15N/14N isotopic ratio
Publication date :
01 November 2009
Journal title :
Icarus
ISSN :
0019-1035
eISSN :
1090-2643
Publisher :
Academic Press, San Diego, United States - California
Volume :
204
Pages :
346-348
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/0906.5221
Available on ORBi :
since 22 February 2010

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