Reference : High-dispersion infrared spectroscopic observations of comet 8P/Tuttle with VLT/CRIRES
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/9002
High-dispersion infrared spectroscopic observations of comet 8P/Tuttle with VLT/CRIRES
English
Kobayashi, H. [Department of Physics, Faculty of Science, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto, Japan]
Bockelée-Morvan, D. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
Kawakita, H. [Department of Physics, Faculty of Science, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto, Japan]
Dello Russo, N. [Space Department, The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA]
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) >]
Smette, A. [European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago 19, Chile]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Stüwe, J. [Leiden Observatory, 2300 RA Leiden, The Netherlands]
Weiler, M. [GEPI, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
Arpigny, Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Biver, N. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
Cochran, A. [Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, USA]
Crovisier, J. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
Magain, Pierre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Sana, H. [European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago 19, Chile]
Schulz, R. [ESA/RSSD, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands]
Vervack, R. J. [Space Department, The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA]
Weaver, H. [Space Department, The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA]
Zucconi, Jean-Marc [Observatoire de Besançon, 25010 Besançon Cedex, France]
1-Jan-2010
Astronomy and Astrophysics
509
A80, pp. 1-9
Yes (verified by ORBi)
International
0004-6361
1432-0746
[en] comets: individual: 8P/Tuttle ; planets and satellites: formation ; Kuiper belt: general
[en] We report on the composition of the Halley-family comet (HFC) 8P/Tuttle investigated with high-dispersion near-infrared spectroscopic observations. The observations were carried out at the ESO VLT (Very Large Telescope) with the CRIRES instrument as part of a multi-wavelength observation campaign of 8P/Tuttle performed in late January and early February 2008. Radar observations suggested that 8P/Tuttle is a contact binary, and it was proposed that these components might be heterogeneous in chemistry. We determined mixing ratios of organic volatiles with respect to H[SUB]2[/SUB]O and found that mixing ratios were consistent with previous near infrared spectroscopic observations obtained in late December 2007 and in late January 2008. It has been suggested that because 8P/Tuttle is a contact binary, it might be chemically heterogeneous. However, we find no evidence for chemical heterogeneity within the nucleus of 8P/Tuttle. We also compared the mixing ratios of organic molecules in 8P/Tuttle with those of both other HFCs and long period comets (LPCs) and found that HCN, C[SUB]2[/SUB]H[SUB]2[/SUB], and C[SUB]2[/SUB]H[SUB]6[/SUB] are depleted whereas CH[SUB]4[/SUB] and CH[SUB]3[/SUB]OH have normal abundances. This may indicate that 8P/Tuttle was formed in a different region of the early solar nebula than other HFCs and LPCs. We estimated the conversion efficiency from C[SUB]2[/SUB]H[SUB]2[/SUB] to C[SUB]2[/SUB]H[SUB]6[/SUB] by hydrogen addition reactions on cold grains by employing the C[SUB]2[/SUB]H[SUB]6[/SUB]/(C[SUB]2[/SUB]H[SUB]6[/SUB]+C[SUB]2[/SUB]H[SUB]2[/SUB]) ratio. The C[SUB]2[/SUB]H[SUB]6[/SUB]/(C[SUB]2[/SUB]H[SUB]6[/SUB]+C[SUB]2[/SUB]H[SUB]2[/SUB]) ratio in 8P/Tuttle is consistent with the ratios found in other HFCs and LPCs within the error bars. We also discuss the source of C[SUB]2[/SUB] and CN based on our observations and conclude that the abundances of C[SUB]2[/SUB]H[SUB]2[/SUB] and C[SUB]2[/SUB]H[SUB]6[/SUB] are insufficient to explain the C[SUB]2[/SUB] abundances in comet 8P/Tuttle and that the abundance of HCN is insufficient to explain the CN abundances in the comet, so at least one additional parent is needed for each species, as pointed out in previous study. Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Prog. 080.C-0615 and 280.C-5053).We regret to note the death of Dr. J. -M. Zucconi in 2009 May.
http://hdl.handle.net/2268/9002
also: http://hdl.handle.net/2268/41385
10.1051/0004-6361/200912477
http://adsabs.harvard.edu/abs/2010A%26A...509A..80K

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