Reference : The Anomalous 14N/15N Ratio in Comets 122P/1995 S1 (de Vico) and 153P/2002 C1 (Ikeya-Zha...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/30380
The Anomalous 14N/15N Ratio in Comets 122P/1995 S1 (de Vico) and 153P/2002 C1 (Ikeya-Zhang)
English
Jehin, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Manfroid, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Cochran, A. L. mailto [Department of Astronomy and McDonald Observatory, University of Texas at Austin, RLM 15.308, C-1400, Austin, TX 78712; , wdc@astro.as.utexas.edu, mike@astro.as.utexas.edu.]
Arpigny, Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Zucconi, J.-M. mailto [Observatoire de Besançon, 41 bis Avenue d'Observatoire, F25010 Besançon Cedex, France; .]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Cochran, W. D. mailto [Department of Astronomy and McDonald Observatory, University of Texas at Austin, RLM 15.308, C-1400, Austin, TX 78712; , wdc@astro.as.utexas.edu, mike@astro.as.utexas.edu.]
Endl, M. mailto [Department of Astronomy and McDonald Observatory, University of Texas at Austin, RLM 15.308, C-1400, Austin, TX 78712; , wdc@astro.as.utexas.edu, mike@astro.as.utexas.edu.]
Schulz, R. mailto [ESA/Research and Scientific Support Department, European Space Research and Technology Center, P.O. Box 299, NL-2200 AG Noordwijk, Netherlands; .]
1-Oct-2004
Astrophysical Journal
University of Chicago Press
613
Letters
161-164
Yes (verified by ORBi)
International
0004-637X
Chicago
IL
[en] Comets: General ; Comets: Individual: Name: 122P/de Vico ; Comets: Individual: Name: 153P/Ikeya-Zhang ; Solar System: Formation
[en] High-resolution (R~60,000) spectra of the CN B[SUP]2[/SUP]Sigma[SUP]+[/SUP]-X[SUP]2[/SUP]Sigma[SUP]+[/SUP] (0, 0) band (near 3880 Å) in the Halley-type comet 122P/1995 S1 de Vico (with a period of 74 yr) and the ``intermediate-period'' comet 153P/2002 C1 Ikeya-Zhang (P~370 yr) were obtained with the 2dcoudé spectrograph at the 2.7 m Harlan J. Smith telescope of the McDonald Observatory. The comets were within 1 AU from the Sun (0.66 and 0.92 AU, respectively) at the time of the observations. While the measured [SUP]12[/SUP]C/[SUP]13[/SUP]C isotope ratios of both comets (90+/-10 and 90+/-25, respectively) are in very good agreement with the solar system value, the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios (140+/-20 and 170+/-50, respectively) are approximately half the value in Earth's atmosphere. The similarity is striking between these ratios and those obtained recently for two other long-period Oort Cloud comets, C/1995 O1 (Hale-Bopp) and C/2000 WM1 (LINEAR). While these optical determinations of [SUP]14[/SUP]N/[SUP]15[/SUP]N are consistent with each other, they disagree with those obtained in comet Hale-Bopp from submillimeter measurements of HCN, generally believed to be the main parent of CN. This puzzling difference points toward the existence of (an)other unknown parent(s) of CN, with an even higher [SUP]15[/SUP]N excess. Organic compounds like those found in interplanetary dust particles are good candidates.
Researchers ; Students
http://hdl.handle.net/2268/30380
10.1086/425254
http://adsabs.harvard.edu/abs/2004ApJ...613L.161J

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