Post-Perihelion HST Observations of Comet Hale–Bopp (C/1995 O1)

Weaver, Harold A.; Feldman, P. D.; A’Hearn, Michael F.; Arpigny, C.; Brandt, J. C.; Stern, S. A.

doi:10.1006/icar.1999.6159

Cited by 53 publications

(44 citation statements)

References 18 publications

(21 reference statements)

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“…As can be seen in Fig. 2, this model is in good agreement with the values by Weaver et al (1999b) and Dello for the postperihelion measurements. Comet Hale-Bopp showed a slightly higher water production pre-perihelion.…”

Section: Model Input: the Nucleus -Properties And Compositionsupporting

confidence: 89%

“…2. Water production rate (diamonds) estimated for the model input and water production rates (crosses) measured by Weaver et al (1999b) and (stars) Dello .…”

Section: The Main Chemical Reaction Network For the Formation Of C 2 mentioning

confidence: 99%

“…The production rates for CO 2 have been extrapolated based on the values obtained by Weaver et al (1999b), assuming that the activity scales with heliocentric distance as CO.…”

Section: Model Input: the Nucleus -Properties And Compositionmentioning

confidence: 99%

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The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU

Helbert¹,

Rauer²,

Boice

et al. 2005

A&A

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The extraordinary activity of comet C/1995 O1 (Hale-Bopp) made it possible to observe the emission bands of the radicals C 2 and C 3 in the optical wavelengths range at heliocentric distances larger than 3 AU. Based on these observations, we perform an analysis of the formation of C 2 and C 3 in a comet coma at large heliocentric distances. We present the most complete chemical reaction network used until today, computing the formation of C 2 and C 3 from C 2 H 2 , C 2 H 6 , and C 3 H 4 as their parent molecules. The required photodissociation rates of C 3 H 2 and C 3 had to be derived based on the observations. The spatial distributions of C 2 and C 3 calculated with the chemical model show good agreement with the observations over the whole range of heliocentric distances covered in this work. Based on the production rates for C 2 H 2 , C 2 H 6 , and C 3 H 4 , abundance ratios are obtained for heliocentric distances r h ≥ 3 AU. In comet Hale-Bopp, C 2 H 2 and C 2 H 6 were measured directly by infrared observations only at heliocentric distance r h ≤ 3 AU . The model presented here greatly extends the heliocentric distance range over which hydrocarbons can be studied in the coma of comet Hale-Bopp. We discuss possible indications of these abundance ratios for the formation region of comet Hale-Bopp.

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Section: Model Input: the Nucleus -Properties And Compositionsupporting

confidence: 89%

“…2. Water production rate (diamonds) estimated for the model input and water production rates (crosses) measured by Weaver et al (1999b) and (stars) Dello .…”

Section: The Main Chemical Reaction Network For the Formation Of C 2 mentioning

confidence: 99%

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The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU

Helbert¹,

Rauer²,

Boice

et al. 2005

A&A

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“…Brooke et al (1996) noted that the two P6.5 2 + and 2 À (1-0) band lines of OH detected in C/1996 B2 (Hyakutake) were sharply peaked at the nucleus, which is characteristic of PE, while two (2-1) band lines of lower rotational excitation ( P3.5 1 + and 1 À ) had spatial distributions with both prompt and fluorescent components. (Unlike PE, the spatial profile of fluorescent OH is much flatter and in most cases does not peak at the nucleus [e.g., Weaver et al 1999].) In B04, we reported the first direct comparison of simultaneously measured high-J OH (via the N 0 ¼ 11 quadruplet near 3046 cm À1 ) and H 2 O (via hot-band emission near 2.9 m) in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR), and we demonstrated that the spatial profile of OH Ã tracks closely that of H 2 O, as expected for PE.…”

Section: Spatial Distributions Of Infrared H 2 O and Oh Emissionmentioning

confidence: 99%

“…One of the largest surveys is a groundbased taxonomic study of 85 comets, based on narrowband photometry of OH and other species (A'Hearn et al 1995). The A-X system was detected in a high-resolution spectroscopic survey of more than 50 comets observed with the International Ultraviolet Explorer (IUE; e.g., Festou & Feldman 1987;Budzien et al 1994), and spatial-spectral measurements of the A-X emission band were acquired with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope (HST; e.g., Feldman 1997;Weaver et al 1999). …”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study of Infrared OH Prompt Emission in Two Comets. I. Observations and Effectiveg‐Factors

Bonev

Mumma

DiSanti

et al. 2006

ApJ

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We present high-dispersion infrared spectra of hydroxyl (OH ) in comets C /2000 WM 1 (LINEAR) and C /2004 Q2 (Machholz), acquired with the Near Infrared Echelle Spectrograph at the Keck Observatory atop Mauna Kea, Hawaii. Most of these rovibrational transitions result from photodissociative excitation of H 2 O giving rise to OH ''prompt'' emission. We present calibrated emission efficiencies (equivalent g-factors, measured in OH photons s À1 [ H 2 O molecule] À1 ) for more than 20 OH lines sampled in these two comets. The OH transitions analyzed cover a broad range of rotational excitation. This infrared database for OH can be used in two principal ways: (1) as an indirect tool for obtaining water production in comets simultaneously with the production of other parent volatiles, even when direct detections of H 2 O are not available; and (2) as an observational constraint to models predicting the rotational distribution of rovibrationally excited OH produced by water photolysis.

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Water Production and Release in Comet C/1995 O1 Hale–Bopp

Russo

2000

Icarus

102

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Post-Perihelion HST Observations of Comet Hale–Bopp (C/1995 O1)

Cited by 53 publications

References 18 publications

The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU

The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU

A Comprehensive Study of Infrared OH Prompt Emission in Two Comets. I. Observations and Effectiveg‐Factors

Water Production and Release in Comet C/1995 O1 Hale–Bopp

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Post-Perihelion HST Observations of Comet Hale–Bopp (C/1995 O1)

Cited by 53 publications

References 18 publications

The chemistry of C2and C3in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesrh≥2.9 AU

The chemistry of C2and C3in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesrh≥2.9 AU

A Comprehensive Study of Infrared OH Prompt Emission in Two Comets. I. Observations and Effectiveg‐Factors

Water Production and Release in Comet C/1995 O1 Hale–Bopp

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The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU

The chemistry of C₂and C₃in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distancesr_h≥2.9 AU