Measurements of [C I] emission from comet Hale-Bopp

R. J. Oliversen, N. Doane, F. Scherb, Walter M Harris, J. P. Morgenthaler

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We present quantitative measurements of cometary [C I] 9850 Å emission obtained during observations of comet Hale-Bopp (C/1995 O1) in 1997 March and April. The observations were carried out using a high-resolution (λ/Δλ ≈ 40,000) Fabry-Pérot/CCD spectrometer at the McMath-Pierce Solar telescope on Kitt Peak. This forbidden line, the carbon analog of [O I] 6300 Å, is emitted in the radiative decay of C(1D) atoms. In the absence of other sources and sinks, [C I] 9850 Å emission can be used as a direct tracer of CO photo-dissociation in comets. However, in Hale-Bopp's large, dense coma, other processes, such as collisional excitation of ground-state C(3P), dissociative recombination of CO+, and collisional dissociation of CO and CO2 may produce significant amounts of C(1D). The long C(1D) radiative lifetime (∼4000 s) makes collisional deexcitation (quenching) the primary loss mechanism in the inner coma. Thus, a detailed, self-consistent global model of collisional and photochemical interactions is necessary to fully account for [C I] 9850 Å emission in comet Hale-Bopp.

Original languageEnglish (US)
Pages (from-to)770-775
Number of pages6
JournalAstrophysical Journal
Volume581
Issue number1 I
DOIs
StatePublished - Dec 10 2002
Externally publishedYes

Fingerprint

Hale-Bopp comet
Hale-Bopp
comet
coma
radiative lifetime
sinks
comets
photodissociation
recombination
tracers
charge coupled devices
spectrometer
tracer
quenching
telescopes
dissociation
spectrometers
analogs
ground state
carbon

Keywords

  • Comets: individual (Hale-Bopp (C/1995 O1))

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Oliversen, R. J., Doane, N., Scherb, F., Harris, W. M., & Morgenthaler, J. P. (2002). Measurements of [C I] emission from comet Hale-Bopp. Astrophysical Journal, 581(1 I), 770-775. https://doi.org/10.1086/344149

Measurements of [C I] emission from comet Hale-Bopp. / Oliversen, R. J.; Doane, N.; Scherb, F.; Harris, Walter M; Morgenthaler, J. P.

In: Astrophysical Journal, Vol. 581, No. 1 I, 10.12.2002, p. 770-775.

Research output: Contribution to journalArticle

Oliversen, RJ, Doane, N, Scherb, F, Harris, WM & Morgenthaler, JP 2002, 'Measurements of [C I] emission from comet Hale-Bopp', Astrophysical Journal, vol. 581, no. 1 I, pp. 770-775. https://doi.org/10.1086/344149
Oliversen RJ, Doane N, Scherb F, Harris WM, Morgenthaler JP. Measurements of [C I] emission from comet Hale-Bopp. Astrophysical Journal. 2002 Dec 10;581(1 I):770-775. https://doi.org/10.1086/344149
Oliversen, R. J. ; Doane, N. ; Scherb, F. ; Harris, Walter M ; Morgenthaler, J. P. / Measurements of [C I] emission from comet Hale-Bopp. In: Astrophysical Journal. 2002 ; Vol. 581, No. 1 I. pp. 770-775.
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