Tentative identification of pyrene as a polycyclic aromatic molecule in UV spectra of comet P/Halley: An emission from 368 to

Clairemidi, J.; Bréchignac, Ph.; Moreels, G.; Pautet, D.

doi:10.1016/j.pss.2003.08.029

Cited by 32 publications

(25 citation statements)

References 29 publications

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“…Among the large family of PAHs, we identified phenanthrene (Moreels et al 1994) and pyrene (Clairemidi et al 2004) from TKS spectra of Halley's inner coma. These two PAHs were also identified in the samples of the comet 81P/Wild 2 collected by Stardust (Sandford et al 2006;Clemett et al 2007), and presented as a good match to the material excavated by the Deep Impact experiment from comet 9P/Tempel 1, as observed by the Spitzer Space Telescope at 5-35 μm (Lisse et al 2006).…”

Section: Spectra Of Halley's Inner Comamentioning

confidence: 99%

“…The experimental conditions are described in Hermine (1994), Moreels et al (1994) and Clairemidi et al (2004). A heated (50…”

Section: Identification Of Anthracenementioning

confidence: 99%

“…Following the same approach as in our previous cometary PAH work (Moreels et al 1994;, Clairemidi et al 2004), i.e. relying on the absolute oscillator strength for S 1 ← S 0 absorption and fluorescence quantum yields from S 1 (near λ exc = 344 nm, Q 0.2) , integrating the cometary intensity in anthracene bands (from Fig.…”

Section: Identification Of Anthracenementioning

confidence: 99%

“…The cometary spectra were compared to laboratory laser-induced fluorescence spectra of PAHs having 2, 3 or 4 aromatic rings. Two PAHs, namely phenanthrene (C 14 H 10 ) and pyrene (C 16 H 10 ), were thus identified by the presence of three peaks in their individual spectra between 342 and 384 nm (Moreels et al 1994;Clairemidi et al 2004). This first identification of PAHs in 1P/Halley was independently confirmed by the detection of an IR emission at 3.28 μm by the infrared spectrometer (IKS) onboard the Vega2 probe, due to a mixture of aliphatic species and aromatic polycyclic compounds (Encrenaz et al 1988).…”

Section: Introductionmentioning

confidence: 99%

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Identification of anthracene in Comet 1P/Halley

Clairemidi¹,

Moreels²,

Mousis³

et al. 2008

A&A

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Context. Polycyclic aromatic hydrocarbons (PAHs) have been detected in many interstellar medium (ISM) sources. They are considered among the most abundant organic compounds in these environments. Aims. We aim at identifying the carriers of the near UV fluorescence bands that appear in the spectra of 1P/Halley's inner coma. Methods. Near UV spectra of 1P/Halley were recorded on March 9, 1986 by the three-channel spectrometer onboard the Vega2 spacecraft at projected distances of between 421 and 932 km. We compare these data to laboratory spectra obtained under laser-induced fluorescence conditions in a jet-cooled molecular beam. Results. The cometary spectral features are found to be consistent with the laboratory fluorescence spectrum of anthracene. Four main peaks coincide at 363, 367.5, 373 and 382.5 nm. We then report the identification of anthracene, a three-ring PAH in the inner coma of 1P/Halley at projected distances of less than thousand km. We derive an abundance relative to water of 5 × 10 −5 to 1 × 10for this molecule. This new detection adds to the previously reported UV identifications of phenanthrene and pyrene in the innermost coma of 1/P Halley. Conclusions. Recently, three small PAHs, namely naphtalene, phenanthrene and pyrene, were identified in dust grains collected by the Stardust probe in the environment of Comet 81P/Wild2. These findings, together with the present identification of anthracene in 1P/Halley's near UV spectra, confirm that similarities exist between the composition of comets and that of the ISM.

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Section: Spectra Of Halley's Inner Comamentioning

confidence: 99%

“…The experimental conditions are described in Hermine (1994), Moreels et al (1994) and Clairemidi et al (2004). A heated (50…”

Section: Identification Of Anthracenementioning

confidence: 99%

Section: Identification Of Anthracenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of anthracene in Comet 1P/Halley

Clairemidi¹,

Moreels²,

Mousis³

et al. 2008

A&A

Self Cite

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“…This band is subject to blending with OH prompt emission and CH 4 fluorescence emission. In comet Halley, a recent reanalysis of TKS data (Clairemidi et al 2004) added a tentative detection of pyrene C 16 H 10 to that of phenanthrene C 14 H 10 (Moreels et al 1993). PAHs are seen in laser ablation of those IDPs thought to be cometary in origin (Clemett et al 1993).…”

Section: Polycyclic Aromatic Hydrocarbons (Pahs)mentioning

confidence: 99%

Observations of Molecules in Comets

Despois

Biver

Bockelée‐Morvan

et al. 2006

IAU

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Abstract. Comets are among the most primitive bodies of the Solar System, and their chemical composition is rich in information on the protosolar nebula and its possible connection with interstellar cloud chemistry. Comets are also a source of light atoms and probably of prebiotic organic molecules for the early Earth.We know better and better cometary volatiles through spectroscopy, mainly at infrared and radio wavelengths. Another crucial component of cometary matter -organic refractories -is however still poorly characterized.We summarize here the ∼ 30 abundances and ∼ 20 upper limits obtained on cometary volatiles and highlight a few species and problems: ethylene glycol, NS, HNC/HCN, 14 N/ 15 N, CN origin, CS2, PAHs, and H2O measurements. Comet-to-comet variations and comet internal heliocentric variations can now be studied, and cometary comas are mapped with a variety of techniques. We list temperature indicators: they can help understand the relation between IS and cometary matters, which present both a global similarity, and marked differences, like the high ethylene glycol content of comets.We conclude by picking up a few key problems to be addressed by future ground-based and space instruments or by cometary sample analysis. For many species, however, laboratory data are missing on spectroscopy, photodissociation and collisions with H2O.

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Introduction

2014

Comets and Their Origin

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Tentative identification of pyrene as a polycyclic aromatic molecule in UV spectra of comet P/Halley: An emission from 368 to

Cited by 32 publications

References 29 publications

Identification of anthracene in Comet 1P/Halley

Identification of anthracene in Comet 1P/Halley

Observations of Molecules in Comets

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