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Outgassing and chemical evolution of C/2012 S1 (ISON)
Dello Russo, Neil; Vervack, Ronald J.; Kawakita, Hideyo et al.
2015In Bulletin of the American Astronomical Society, 47, p. 415.12
 

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Keywords :
comets; solar ystem
Abstract :
[en] Volatile production rates, relative abundances, rotational temperatures, and spatial distributions in the coma were measured in C/2012 S1 (ISON) using long-slit high-dispersion (λ/Δλ ~ 25,000) infrared spectroscopy as part of a worldwide observing campaign. Spectra were obtained on UT 2013 October 26 and 28 with NIRSPEC at the W. M. Keck Observatory, and UT 2013 November 19 and 20 with CSHELL at the NASA IRTF. H[SUB]2[/SUB]O was detected on all dates, with production rates increasing by about a factor of 40 between October 26 (R[SUB]h[/SUB] = 1.12 AU) and November 20 (R[SUB]h[/SUB] = 0.43 AU). Short-term variability of H[SUB]2[/SUB]O was also seen as the production rate increased by nearly a factor of two during observations obtained over a period of about six hours on November 19. C[SUB]2[/SUB]H[SUB]6[/SUB], CH[SUB]3[/SUB]OH and CH[SUB]4[/SUB] abundances were slightly depleted relative to H[SUB]2[/SUB]O in ISON compared to mean values for comets measured at infrared wavelengths. On the November dates, C[SUB]2[/SUB]H[SUB]2[/SUB], HCN and OCS abundances relative to H[SUB]2[/SUB]O appear to be close to the range of mean values, whereas H[SUB]2[/SUB]CO and NH[SUB]3[/SUB] were significantly enhanced. We will compare derived chemical abundances in ISON to other comets measured with infrared spectroscopy.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dello Russo, Neil;  JHU-APL
Vervack, Ronald J.;  JHU-APL
Kawakita, Hideyo;  Koyama Astronomical Observatory, Kyoto Sangyo University
Cochran, Anita;  McDonald Observatory
McKay, Adam J.;  McDonald Observatory
Harris, Walter M.;  Lunar and Planetary Laboratory, University of Arizona
Weaver, Harold A.;  JHU-APL
Lisse, Carey M.;  JHU-APL
DiSanti, Michael A.;  NASA-GSFC
Kobayashi, Hitomi;  Koyama Astronomical Observatory, Kyoto Sangyo University
Biver, Nicolas;  LESIA, Observatoire de Paris
Bockelée-Morvan, Dominique;  LESIA, Observatoire de Paris
Crovisier, Jacques;  LESIA, Observatoire de Paris
Opitom, Cyrielle ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jehin, Emmanuel  ;  Université de Liège - ULiège
More authors (5 more) Less
Language :
English
Title :
Outgassing and chemical evolution of C/2012 S1 (ISON)
Publication date :
01 November 2015
Event name :
47th DPS Meeting
Event place :
Washington DC, United States
Event date :
8-13 November 2015
Audience :
International
Journal title :
Bulletin of the American Astronomical Society
ISSN :
0002-7537
eISSN :
2330-9458
Publisher :
American Astronomical Society, New-York, United States - New York
Volume :
47
Pages :
415.12
Available on ORBi :
since 12 January 2016

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