The Diffuse Interstellar Bands: an Elderly Astro-Puzzle Rejuvenated

Cox, Nicholas

doi:10.1017/s1743921311024951

Cited by 3 publications

(2 citation statements)

References 77 publications

(60 reference statements)

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“…In this case, the liberated species will now look more like molecules than nanoparticles but must obviously suffer the consequences and bear the marks of dehydrogenation and exist as cations in these harsh environments (e.g. [107]). Nevertheless, the observed structure in DIBs that appear to be somewhat UV-resistant does seem to be consistent with the rotational contours of rather 5−40 atom gas-phase molecules [57,32].…”

Section: Top-down Branching and Diffuse Interstellar Band Carrier Formentioning

confidence: 99%

“…No significant correlation between the UV bump, the far-UV extinction rise and the DIB strengths has been found (e.g. [107]) However, in the Small Magellanic Cloud, it appears that when the UV bump is weak or absent, so are the DIBs [108]. Thus, there is some evidence that when the interstellar nanoparticles responsible for the UV bump are destroyed, so are the DIB carriers and, as noted above ( §6.7), the anti-correlation of some DIBs with CN seems to indicate that nitrogen may play a role in the DIB carrier chemistry.…”

Section: Low Branches: Radical and Molecular Ionsmentioning

confidence: 99%

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Dust evolution, a global view: II. Top-down branching, nanoparticle fragmentation and the mystery of the diffuse interstellar band carriers

Jones¹

2016

R. Soc. open sci.

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The origin of the diffuse interstellar bands (DIBs), one of the longest-standing mysteries of the interstellar medium (ISM), is explored within the framework of The Heterogeneous dust Evolution Model for Interstellar Solids (THEMIS). The likely nature of the DIB carriers and their evolution is here explored within the framework of the structures and sub-structures inherent to doped hydrogenated amorphous carbon grains in the ISM. Based on the natural aromatic-rich moieties (asphaltenes) recovered from coal and oil, the likely structure of their interstellar analogues is investigated within the context of the diffuse band problem. It is here proposed that the top-down evolution of interstellar carbonaceous grains, and, in particular, a-C(:H) nanoparticles, is at the heart of the formation and evolution of the DIB carriers and their associations with small molecules and radicals, such as C2, C3, CH and CN. It is most probable that the DIBs are carried by dehydrogenated, ionized, hetero-cyclic, olefinic and aromatic-rich moieties that form an integral part of the contiguous structure of hetero-atom-doped hydrogenated amorphous carbon nanoparticles and their daughter fragmentation products. Within this framework, it is proposed that polyene structures in all their variants could be viable DIB carrier candidates.

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Section: Top-down Branching and Diffuse Interstellar Band Carrier Formentioning

confidence: 99%

Section: Low Branches: Radical and Molecular Ionsmentioning

confidence: 99%

Dust evolution, a global view: II. Top-down branching, nanoparticle fragmentation and the mystery of the diffuse interstellar band carriers

Jones¹

2016

R. Soc. open sci.

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A Catalog of Diffuse Interstellar Bands in Fullerene-Containing Planetary Nebulae

et al. 2013

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Abstract. Large fullerenes and fullerene-based molecules have been proposed as carriers of diffuse interstellar bands (DIBs). The recent detection of the most common fullerenes (C60 and C70 ) around some Planetary Nebulae (PNe) now enable us to study the DIBs in fullerene-rich space environments. We have studied the presence of DIBs in the optical spectra (∼3300-9400 A) of two fullerene-containing PNe (Tc 1 and M 1-20). Special attention is given to DIBs which are found to be unusually intense in fullerene-containing PNe; several of these DIBS have not previously been reported. Fullerenes larger than C60 (and C70 ) and multishell fullerenes may be possible candidate carriers for the unusual DIBs seen in fullerene-rich environments.

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INTERACTION BETWEEN THE BROAD-LINED TYPE Ic SUPERNOVA 2012ap AND CARRIERS OF DIFFUSE INTERSTELLAR BANDS

Milisavljevic

Margutti

Crabtree

et al. 2014

ApJ

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The diffuse interstellar bands (DIBs) are absorption features observed in optical and near-infrared spectra that are thought to be associated with carbon-rich polyatomic molecules in interstellar gas. However, because the central wavelengths of these bands do not correspond with electronic transitions of any known atomic or molecular species, their nature has remained uncertain since their discovery almost a century ago. Here we report on unusually strong DIBs in optical spectra of the broadlined Type Ic supernova SN 2012ap that exhibit changes in equivalent width over short ( 30 days) timescales. The 4428Å and 6283Å DIB features get weaker with time, whereas the 5780Å feature shows a marginal increase. These nonuniform changes suggest that the supernova is interacting with a nearby source of the DIBs and that the DIB carriers possess high ionization potentials, such as small cations or charged fullerenes. We conclude that moderate-resolution spectra of supernovae with DIB absorptions obtained within weeks of outburst could reveal unique information about the mass-loss environment of their progenitor systems and provide new constraints on the properties of DIB carriers.

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The Diffuse Interstellar Bands: an Elderly Astro-Puzzle Rejuvenated

Cited by 3 publications

References 77 publications

Dust evolution, a global view: II. Top-down branching, nanoparticle fragmentation and the mystery of the diffuse interstellar band carriers

Dust evolution, a global view: II. Top-down branching, nanoparticle fragmentation and the mystery of the diffuse interstellar band carriers

A Catalog of Diffuse Interstellar Bands in Fullerene-Containing Planetary Nebulae

INTERACTION BETWEEN THE BROAD-LINED TYPE Ic SUPERNOVA 2012ap AND CARRIERS OF DIFFUSE INTERSTELLAR BANDS

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