Rocket‐borne Long‐Slit Ultraviolet Spectroscopy of Comet Hale‐Bopp

McPhate, J. B.; Feldman, P. D.; McCandliss, Stephan R.; Burgh, Eric B.

doi:10.1086/307561

Cited by 38 publications

(60 citation statements)

References 16 publications

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“…There are also emission lines from atomic oxygen in the UV, at 1304 and 1356 Å, which we list in Table 4 for completeness, but note that these are weak and have not been used to derive production rates. Also only observable from space, they were detected in C/1995 O1 (Hale-Bopp) from sounding rocket observations (McPhate et al 1999), and from close range in 67P by Rosetta/ALICE (Feldman et al 2015), but the excitation process (photons vs electrons), and therefore the production rate, is highly model dependent (see Sect. 7).…”

Section: Uv/visible Emission Featuresmentioning

confidence: 99%

The Main Belt Comets and ice in the Solar System

Snodgrass

Agarwal

Combi

et al. 2017

Astron Astrophys Rev

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We review the evidence for buried ice in the asteroid belt; specifically the questions around the so-called Main Belt Comets (MBCs). We summarise the evidence for water throughout the Solar System, and describe the various methods for detecting it, including remote sensing from ultraviolet to radio wavelengths. We review progress in the first decade of study of MBCs, including observations, modelling of ice survival, and discussion on their origins. We then look at which methods will likely be most effective for further progress, including the key challenge of direct detection of (escaping) water in these bodies.

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Section: Uv/visible Emission Featuresmentioning

confidence: 99%

The Main Belt Comets and ice in the Solar System

Snodgrass

Agarwal

Combi

et al. 2017

Astron Astrophys Rev

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“…The basic configuration has been described by McCandliss et al (1994McCandliss et al ( , 2000 and Burgh et al (2001), and two similar missions using this payload have flown ( Burgh et al 2002;France et al 2004). This was the first flight for a newly reconfigured spectrograph with a holographically corrected concave grating , for improving the spatial resolution (3 00 spacecraft pointing limited), and a high-QE KBr-coated microchannel plate with doubledelay line anode (%25 m resolution element), similar to that used by McPhate et al (1999).…”

Section: Fusementioning

confidence: 99%

Molecular and Atomic Excitation Stratification in the Outflow of the Planetary Nebula M27

McCandliss¹,

France²,

Lupu³

et al. 2007

ApJ

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High-resolution spectroscopy with FUSE and HST STIS of atomic and molecular velocity stratification in the nebular outflow of M27 challenge models of the abundance kinematics in planetary nebulae. The simple picture of a very high speed ($1000 km s À1 ), high-ionization, radiation-driven stellar wind surrounded by a slower ($10 km s À1 ) mostly molecular outflow, with low-ionization and neutral atomic species residing at the wind interaction interface, is not supported. Instead, we find vibrationally excited H 2 intermixed with mostly neutral atomic species at a transition velocity (33 km s À1 ) between a fast (33Y65 km s À1 ) low-ionization zone and a slow (P33 km s À1 ) high-ionization zone. Ly fluorescence of H 2 has been detected, but far-UV continuum fluorescence has not. The diffuse nebular medium is inhospitable to molecules and dust. Maintaining a modest equilibrium abundance of H 2 [N (H 2 )/N (H i)T1] in the diffuse nebular medium requires a source of H 2 , mostly likely the clumpy nebular medium. The stellar SED shows no sign of reddening [E(B À V ) < 0:01], but paradoxically H /H indicates E(B À V ) $ 0:1. The enhancement of H /H in the absence of dust may result from a two-step process of H 2 ionization by Lyman continuum photons followed by dissociative recombination [ H 2 + ! H þ 2 + e À ! H(1s) + H(nl )], which ultimately produces fluorescence of H and Ly . In the optically thin limit at the inferred radius of the velocity transition, we find that dissociation of H 2 by stellar Lyman continuum photons is an order of magnitude more efficient than spontaneous dissociation by far-UV photons. The importance of this H 2 destruction process in H ii regions has been overlooked.

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“…CO ultraviolet fluorescence in cometary spectra was first detected during sounding rocket observations of comet West (C/1975 V1;Feldman & Brune 1976) and has been subsequently observed by IUE ( Tozzi et al1998), HST ( Weaver1998), FUSE , the Hopkins Ultraviolet Telescope on the Astro-1 space shuttle mission (Feldman et al 1991), and rockets (Woods et al 1987;Sahnow et al 1993;McPhate et al 1999). The most important spectral features of CO in the ultraviolet (UV ) are its electronic transitions belonging to the A À X , B À X , and C À X systems, or to the forbidden Cameron bands.…”

Section: Introductionmentioning

confidence: 99%

The Fourth Positive System of Carbon Monoxide in theHubble Space TelescopeSpectra of Comets

Lupu

Feldman

Weaver

et al. 2007

ApJ

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The rich A 1 Å À X 1 AE þ system of carbon monoxide accounts for most spectral features seen in long-slit HST STIS observations of comets 153P/ Ikeya-Zhang, C/2001 Q4 (NEAT), and C/2000 WM 1 (LINEAR), as well as in the HST GHRS spectrum of comet C/1996 B2 ( Hyakutake). A detailed CO fluorescence model is developed to derive the CO abundances in these comets by simultaneously fitting all of the observed A À X bands. The model includes the latest values for the oscillator strengths and state parameters, and accounts for optical depth effects due to line overlap and self-absorption. The derived CO abundances relative to water in these comets span a wide range, from 0:44% AE 0:03% for C/2000 WM 1 (LINEAR), 7:2% AE 0:4% for 153P/Ikeya-Zhang, and 8:8% AE 0:8% for C/2001 Q4 (NEAT) to 20:9% AE 0:3% for C/1996 B2 (Hyakutake). The radial profiles of the CO column density are consistent with a predominantly native source for all the comets observed by STIS. A complete fitting of the CO spectral features using the fluorescence model leads to the first identification of a molecular hydrogen line pumped by solar H

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Rocket‐borne Long‐Slit Ultraviolet Spectroscopy of Comet Hale‐Bopp

Cited by 38 publications

References 16 publications

The Main Belt Comets and ice in the Solar System

The Main Belt Comets and ice in the Solar System

Molecular and Atomic Excitation Stratification in the Outflow of the Planetary Nebula M27

The Fourth Positive System of Carbon Monoxide in theHubble Space TelescopeSpectra of Comets

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