Fullerenes and fulleranes in circumstellar envelopes

Zhang, Yong; Kwok, Sun; Sadjadi, SeyedAbdolreza

doi:10.1088/1742-6596/728/5/052004

Cited by 7 publications

(5 citation statements)

References 37 publications

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“…Two spectral lines at 9577 Å and 9632 Å match a singly charged fullerine C + 60 (Campbell et al 2015), although such an identification of only 2 out of some 400 similar lines can be questioned. More recently there have been claims for the presence of other features attributed to fulleranes in the spectrum of the proto-PNe IRAS01005+7910 (Zhang, Kwok & Sadjadi 2016). Fullerine cages that have also been discovered in carbonaceous chondrites provide an additional line of evidence.…”

Section: Organic Molecules In Spacementioning

confidence: 99%

Cosmic biology in perspective

Wickramasinghe

Tout

et al. 2019

Astrophys Space Sci

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A series of astronomical observations obtained over the period 1986 to 2018 supports the idea that life is a cosmic rather than a purely terrestrial or planetary phenomenon. These include (1) the detection of biologically relevant molecules in interstellar clouds and in comets, (2) mid-infrared spectra of interstellar grains and the dust from comets, (3) a diverse set of data from comets including the Rosetta mission showing consistency with biology and (4) the frequency of Earth-like or habitable planets in the Galaxy. We argue that the conjunction of all the available data suggests the operation of cometary biology and interstellar panspermia rather than the much weaker hypothesis of comets being only the source of the chemical building blocks of life. We conclude with specific predictions on the properties expected of extra-terrestrial life if it is discovered on Enceladus, Europa or beyond. A radically different biochemistry elsewhere can be considered as a falsification of the theory of interstellar panspermia.

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Section: Organic Molecules In Spacementioning

confidence: 99%

Cosmic biology in perspective

Wickramasinghe

Tout

et al. 2019

Astrophys Space Sci

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“…Fullerenes C 60 and C 70 are very abundant compounds in interstellar and circumstellar media. ,, These are unsaturated compounds placed in a hydrogen-rich medium. Hence, many works explored the question of their astrochemical hydrogenation, − which should produce fullerene hydrides or fulleranes. These compounds have not been detected, and if they are formed in space, they are significantly less abundant than the parent fullerenes, because fulleranes are prone to dissociate spontaneously or under a UV treatment. , …”

Section: Astrochemical Applications Of Polarizabilitymentioning

confidence: 99%

Polarizability in Astrochemical Studies of Complex Carbon-Based Compounds

Sabirov,

Tukhbatullina,

Shepelevich

2022

ACS Earth Space Chem.

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This Review summarizes the grounds and applications of polarizability to the astrochemical studies on carbon-based compounds, including polycyclic aromatic hydrocarbons and fullerenes. Polarizability is useful for the analysis of physicochemical processes (interactions with positrons, molecular collisions, quenching, and dielectric screening) and chemical reactions. The idea of a combined use of minimum-polarizability and minimum-energy principles for searching for novel candidates for interstellar/circumstellar detection is considered. Insights into the astrochemistry of fullerenes and helicenes coming from their polarizability are discussed.

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“…Zhang cause of high symmetry, the vibrational modes of C 60 are degenerated into four individual infrared features, making the astronomical search possible. Soon after the first detection in a young PN (Cami et al 2010), C 60 was discovered in various astronomical environments, suggesting that it could survive in very harsh conditions, though the formation route is under a controversial debate (see Cami et al 2011and this volume, Zhang & Kwok 2013, Zhang et al 2016, for the details). So far, 11 Galactic PNe and 11 Magellanic Cloud PNe have been detected with C 60 (García-Hernández et al 2012, Sloan et al 2014, Otsuka et al 2016.…”

Section: Fullerene-related Compoundsmentioning

confidence: 99%

“…However, two C 60 -rich PNe do not exhibit any detectable C-H feature (Díaz-Luis et al 2016). Theoretical investigation indicated that with slight hydrogenation, the four C 60 -backbone vibration features at 7.0, 8.5, 17.4, and 18.9 µm are still visible but diminish their intensities in different degrees (Zhang et al 2016). Therefore, C 60 -poor PNe might be more ideal targets for the search of C 60 H m .…”

Section: Fullerene-related Compoundsmentioning

confidence: 99%

Molecular studies of Planetary Nebulae

Zhang

2016

Proc. IAU

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Abstract. Circumstellar envelopes (CEs) around evolved stars are an active site for the production of molecules. After evolving through the Asymptotic Giant Branch (AGB), proto-planetary nebula (PPN), to planetary nebula (PN) phases, CEs ultimately merge with the interstellar medium (ISM). The study of molecules in PNe, therefore, is essential to understanding the transition from stellar to interstellar materials. So far, over 20 molecular species have been discovered in PNe. The molecular composition of PNe is rather different from those of AGB and PPNe, suggesting that the molecules synthesized in PN progenitors have been heavily processed by strong ultraviolet radiation from the central star. Intriguingly, fullerenes and complex organic compounds having aromatic and aliphatic structures can be rapidly formed and largely survive during the PPN/PN evolution. The similar molecular compositions in PNe and diffuse clouds as well as the detection of C + 60 in the ISM reinforce the view that the mass-loss from PNe can significantly enrich the ISM with molecular species, some of which may be responsible for the diffuse interstellar bands. In this contribution, I briefly summarize some recent observations of molecules in PNe, with emphasis on their implications on circumstellar chemistry.

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Fullerenes and fulleranes in circumstellar envelopes

Cited by 7 publications

References 37 publications

Cosmic biology in perspective

Cosmic biology in perspective

Polarizability in Astrochemical Studies of Complex Carbon-Based Compounds

Molecular studies of Planetary Nebulae

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