A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach

Neil Dello Russo, Ronald J. Vervack, Harold A. Weaver, Carey M. Lisse, Hideyo Kawakita, Hitomi Kobayashi, Anita L. Cochran, Walter M Harris, Dominique Bockelée-Morvan, Nicolas Biver, Jacques Crovisier, Adam J. McKay

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We obtained high-resolution (λ/Δλ∼28,000) infrared spectra of Comet 103P/Hartley 2 on UT 2010 November 4.6 using the NIRSPEC spectrometer at the W.M. Keck Observatory. Here we present spectra of Hartley 2 between 2.832 and 3.639μm (3531-2748cm-1), representing the most complete high-resolution infrared survey of a Jupiter-family comet to date in this wavelength region. We have tabulated rest frequencies, line fluxes, line signal-to-noise ratios and line widths for all detected emissions. Fluorescence models, published line lists and laboratory spectra were used to obtain molecular assignments for detected emissions. Multiple lines of the following species were detected in Hartley 2: H2O, OH, CH3OH, C2H6, HCN, C2H2, H2CO, NH3 and NH2. All identified species seen in this survey have been previously detected in comets. There were 364 distinct emission features present in these spectra, of which 36 were unidentified. We compare the spectrum of Hartley 2 to chemically different Jupiter-family Comets 73P/Schwassmann-Wachmann 3-B and 17P/Holmes in order to obtain additional information on the characteristics of unknown lines through the comparison of relative line fluxes for corresponding emissions in these comets. For the strongest unidentified emissions, additional information was also obtained through a comparison of their spatial distributions in the coma to that of known emission features in Hartley 2. This spectral survey of Hartley 2 provides detailed information about its overall volatile chemistry, provides a comparison to past and future high-resolution infrared datasets, and further characterizes the most promising spectral regions for future molecular searches in comets.

Original languageEnglish (US)
Pages (from-to)707-722
Number of pages16
JournalIcarus
Volume222
Issue number2
DOIs
StatePublished - Feb 2013
Externally publishedYes

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night
comet
comets
high resolution
Jupiter (planet)
Jupiter
Schwassmann-Wachmann comet
coma
lists
signal-to-noise ratio
observatories
spatial distribution
signal to noise ratios
spectrometer
fluorescence
infrared spectra
observatory
spectrometers
chemistry
wavelength

Keywords

  • Comets, Composition
  • Infrared observations
  • Spectroscopy

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Dello Russo, N., Vervack, R. J., Weaver, H. A., Lisse, C. M., Kawakita, H., Kobayashi, H., ... McKay, A. J. (2013). A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach. Icarus, 222(2), 707-722. https://doi.org/10.1016/j.icarus.2012.05.023

A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach. / Dello Russo, Neil; Vervack, Ronald J.; Weaver, Harold A.; Lisse, Carey M.; Kawakita, Hideyo; Kobayashi, Hitomi; Cochran, Anita L.; Harris, Walter M; Bockelée-Morvan, Dominique; Biver, Nicolas; Crovisier, Jacques; McKay, Adam J.

In: Icarus, Vol. 222, No. 2, 02.2013, p. 707-722.

Research output: Contribution to journalArticle

Dello Russo, N, Vervack, RJ, Weaver, HA, Lisse, CM, Kawakita, H, Kobayashi, H, Cochran, AL, Harris, WM, Bockelée-Morvan, D, Biver, N, Crovisier, J & McKay, AJ 2013, 'A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach', Icarus, vol. 222, no. 2, pp. 707-722. https://doi.org/10.1016/j.icarus.2012.05.023
Dello Russo N, Vervack RJ, Weaver HA, Lisse CM, Kawakita H, Kobayashi H et al. A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach. Icarus. 2013 Feb;222(2):707-722. https://doi.org/10.1016/j.icarus.2012.05.023
Dello Russo, Neil ; Vervack, Ronald J. ; Weaver, Harold A. ; Lisse, Carey M. ; Kawakita, Hideyo ; Kobayashi, Hitomi ; Cochran, Anita L. ; Harris, Walter M ; Bockelée-Morvan, Dominique ; Biver, Nicolas ; Crovisier, Jacques ; McKay, Adam J. / A high-resolution infrared spectral survey of 103P/Hartley 2 on the night of the EPOXI closest approach. In: Icarus. 2013 ; Vol. 222, No. 2. pp. 707-722.
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abstract = "We obtained high-resolution (λ/Δλ∼28,000) infrared spectra of Comet 103P/Hartley 2 on UT 2010 November 4.6 using the NIRSPEC spectrometer at the W.M. Keck Observatory. Here we present spectra of Hartley 2 between 2.832 and 3.639μm (3531-2748cm-1), representing the most complete high-resolution infrared survey of a Jupiter-family comet to date in this wavelength region. We have tabulated rest frequencies, line fluxes, line signal-to-noise ratios and line widths for all detected emissions. Fluorescence models, published line lists and laboratory spectra were used to obtain molecular assignments for detected emissions. Multiple lines of the following species were detected in Hartley 2: H2O, OH, CH3OH, C2H6, HCN, C2H2, H2CO, NH3 and NH2. All identified species seen in this survey have been previously detected in comets. There were 364 distinct emission features present in these spectra, of which 36 were unidentified. We compare the spectrum of Hartley 2 to chemically different Jupiter-family Comets 73P/Schwassmann-Wachmann 3-B and 17P/Holmes in order to obtain additional information on the characteristics of unknown lines through the comparison of relative line fluxes for corresponding emissions in these comets. For the strongest unidentified emissions, additional information was also obtained through a comparison of their spatial distributions in the coma to that of known emission features in Hartley 2. This spectral survey of Hartley 2 provides detailed information about its overall volatile chemistry, provides a comparison to past and future high-resolution infrared datasets, and further characterizes the most promising spectral regions for future molecular searches in comets.",
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AU - Dello Russo, Neil

AU - Vervack, Ronald J.

AU - Weaver, Harold A.

AU - Lisse, Carey M.

AU - Kawakita, Hideyo

AU - Kobayashi, Hitomi

AU - Cochran, Anita L.

AU - Harris, Walter M

AU - Bockelée-Morvan, Dominique

AU - Biver, Nicolas

AU - Crovisier, Jacques

AU - McKay, Adam J.

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N2 - We obtained high-resolution (λ/Δλ∼28,000) infrared spectra of Comet 103P/Hartley 2 on UT 2010 November 4.6 using the NIRSPEC spectrometer at the W.M. Keck Observatory. Here we present spectra of Hartley 2 between 2.832 and 3.639μm (3531-2748cm-1), representing the most complete high-resolution infrared survey of a Jupiter-family comet to date in this wavelength region. We have tabulated rest frequencies, line fluxes, line signal-to-noise ratios and line widths for all detected emissions. Fluorescence models, published line lists and laboratory spectra were used to obtain molecular assignments for detected emissions. Multiple lines of the following species were detected in Hartley 2: H2O, OH, CH3OH, C2H6, HCN, C2H2, H2CO, NH3 and NH2. All identified species seen in this survey have been previously detected in comets. There were 364 distinct emission features present in these spectra, of which 36 were unidentified. We compare the spectrum of Hartley 2 to chemically different Jupiter-family Comets 73P/Schwassmann-Wachmann 3-B and 17P/Holmes in order to obtain additional information on the characteristics of unknown lines through the comparison of relative line fluxes for corresponding emissions in these comets. For the strongest unidentified emissions, additional information was also obtained through a comparison of their spatial distributions in the coma to that of known emission features in Hartley 2. This spectral survey of Hartley 2 provides detailed information about its overall volatile chemistry, provides a comparison to past and future high-resolution infrared datasets, and further characterizes the most promising spectral regions for future molecular searches in comets.

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KW - Infrared observations

KW - Spectroscopy

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