Article (Scientific journals)
Extremely Organic-rich Coma of Comet C/2010 G2 (Hill) during its Outburst in 2012
Kawakita, Hideyo; Dello Russo, Neil; Vervack, Ron et al.
2014In Astrophysical Journal, 788, p. 110
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Keywords :
comets: general; comets: individual: C/2010 G2 (Hill; ISM: molecules; protoplanetary disks
Abstract :
[en] We performed high-dispersion near-infrared spectroscopic observations of comet C/2010 G2 (Hill) at 2.5 AU from the Sun using NIRSPEC (R ≈ 25,000) at the Keck II Telescope on UT 2012 January 9 and 10, about a week after an outburst had occurred. Over the two nights of our observations, prominent emission lines of CH[SUB]4[/SUB] and C[SUB]2[/SUB]H[SUB]6[/SUB], along with weaker emission lines of H[SUB]2[/SUB]O, HCN, CH[SUB]3[/SUB]OH, and CO were detected. The gas production rate of CO was comparable to that of H[SUB]2[/SUB]O during the outburst. The mixing ratios of CO, HCN, CH[SUB]4[/SUB], C[SUB]2[/SUB]H[SUB]6[/SUB], and CH[SUB]3[/SUB]OH with respect to H[SUB]2[/SUB]O were higher than those for normal comets by a factor of five or more. The enrichment of CO and CH[SUB]4[/SUB] in comet Hill suggests that the sublimation of these hypervolatiles sustained the outburst of the comet. Some fraction of water in the inner coma might exist as icy grains that were likely ejected from nucleus by the sublimation of hypervolatiles. Mixing ratios of volatiles in comet Hill are indicative of the interstellar heritage without significant alteration in the solar nebula.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Kawakita, Hideyo;  Koyama Astronomical Observatory, Kyoto Sangyo University, Motoyama, Kamitamo, Kita, Kyoto 603-8555, Japan
Dello Russo, Neil;  The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723-6099, USA
Vervack, Ron;  The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723-6099, USA
Kobayashi, Hitomi;  Koyama Astronomical Observatory, Kyoto Sangyo University, Motoyama, Kamitamo, Kita, Kyoto 603-8555, Japan
DiSanti, Mike A.;  Goddard Center for Astrobiology, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Opitom, Cyrielle ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Weaver, Harold A. ;  The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723-6099, USA
Cochran, Anita L.;  McDonald Observatory, 1 University Station C1402, Austin, TX 78712-0259, USA
Harris, Walter M.;  Department of Applied Sciences, University of California, One Shields Avenue, Davis, CA 95616, USA
Bockelée-Morvan, Dominique;  LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 Place Jules Janssen, F-92195 Meudon, France
Biver, Nicolas;  LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 Place Jules Janssen, F-92195 Meudon, France
Crovisier, Jacques;  LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 Place Jules Janssen, F-92195 Meudon, France
McKay, Adam J.;  New Mexico State University, Las Cruces, NM 88001, USA
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
More authors (6 more) Less
Language :
English
Title :
Extremely Organic-rich Coma of Comet C/2010 G2 (Hill) during its Outburst in 2012
Publication date :
01 June 2014
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
IOP Publishing
Volume :
788
Pages :
110
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 June 2014

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