Morphology of HCN and CN in Comet Hale-Bopp (1995 O1)

L. M. Woodney, M. F. A'Hearn, David G. Schleicher, Tony L. Farnham, J. P. McMullin, M. C.H. Wright, J. M. Veal, Lewis E. Snyder, Imke De Pater, J. R. Forster, Patrick Palmer, Y. J. Kuan, Wendy R. Williams, Chi C. Cheung, Bridget R. Smith

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Abstract

We compare images of Comet Hale-Bopp (1995 O1) in HCN and CN taken near perihelion (April 1, 1997) to determine the origin of CN in comets. We imaged the J = 1 → 0 transition of HCN at γ = 3 mm with the BIMA Array. Data from two weeks around perihelion were summed within four phase bins based on the rotational period of the comet. This increases both the signal-to-noise ratio and the u-v coverage while decreasing the smearing of the spatial features. The similarly phased narrowband CN images were taken at Lowell Observatory within the same range of dates as the HCN images. We find that there is a better correlation between HCN and CN than between HCN and the optically dominant dust. If the CN in jets does have a dust source it would have to have a very low albedo and/or small particle size. The production rates are consistent with HCN being a primary parent of CN, although there are discrepancies between the HCN destruction scalelength and the CN production scalelength which we discuss.

Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalIcarus
Volume157
Issue number1
DOIs
Publication statusPublished - 2002 Jan 1

Fingerprint

Hale-Bopp comet
Hale-Bopp
comet
comets
dust
albedo
signal-to-noise ratio
destruction
narrowband
observatories
signal to noise ratios
observatory
particle size

Keywords

  • Comets
  • Data reduction techniques
  • Hale-Bopp
  • Photochemistry
  • Radio observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Woodney, L. M., A'Hearn, M. F., Schleicher, D. G., Farnham, T. L., McMullin, J. P., Wright, M. C. H., ... Smith, B. R. (2002). Morphology of HCN and CN in Comet Hale-Bopp (1995 O1). Icarus, 157(1), 193-204. https://doi.org/10.1006/icar.2001.6798

Morphology of HCN and CN in Comet Hale-Bopp (1995 O1). / Woodney, L. M.; A'Hearn, M. F.; Schleicher, David G.; Farnham, Tony L.; McMullin, J. P.; Wright, M. C.H.; Veal, J. M.; Snyder, Lewis E.; De Pater, Imke; Forster, J. R.; Palmer, Patrick; Kuan, Y. J.; Williams, Wendy R.; Cheung, Chi C.; Smith, Bridget R.

In: Icarus, Vol. 157, No. 1, 01.01.2002, p. 193-204.

Research output: Contribution to journalArticle

Woodney, LM, A'Hearn, MF, Schleicher, DG, Farnham, TL, McMullin, JP, Wright, MCH, Veal, JM, Snyder, LE, De Pater, I, Forster, JR, Palmer, P, Kuan, YJ, Williams, WR, Cheung, CC & Smith, BR 2002, 'Morphology of HCN and CN in Comet Hale-Bopp (1995 O1)', Icarus, vol. 157, no. 1, pp. 193-204. https://doi.org/10.1006/icar.2001.6798
Woodney LM, A'Hearn MF, Schleicher DG, Farnham TL, McMullin JP, Wright MCH et al. Morphology of HCN and CN in Comet Hale-Bopp (1995 O1). Icarus. 2002 Jan 1;157(1):193-204. https://doi.org/10.1006/icar.2001.6798
Woodney, L. M. ; A'Hearn, M. F. ; Schleicher, David G. ; Farnham, Tony L. ; McMullin, J. P. ; Wright, M. C.H. ; Veal, J. M. ; Snyder, Lewis E. ; De Pater, Imke ; Forster, J. R. ; Palmer, Patrick ; Kuan, Y. J. ; Williams, Wendy R. ; Cheung, Chi C. ; Smith, Bridget R. / Morphology of HCN and CN in Comet Hale-Bopp (1995 O1). In: Icarus. 2002 ; Vol. 157, No. 1. pp. 193-204.
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