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A search for diffuse bands in fullerene planetary nebulae: evidence of diffuse circumstellar bands

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dc.contributor.author Diaz-Luis, J. J
dc.contributor.author Garcia-Hernandez, D. A
dc.contributor.author Kameswara Rao, N
dc.contributor.author Manchado, A
dc.contributor.author Cataldo, F
dc.date.accessioned 2020-11-10T01:47:47Z
dc.date.available 2020-11-10T01:47:47Z
dc.date.issued 2015-01
dc.identifier.citation Astronomy & Astrophysics, Vol. 573, A97 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6689
dc.description Open Access © ESO http://dx.doi.org/10.1051/0004-6361/201424710 en_US
dc.description.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 towards fullerene-rich space environments. We search DIBs in the optical spectra towards three fullerene-containing PNe (Tc 1, M 1-20, and IC 418). Special attention is given to DIBs which are found to be unusually intense towards these fullerene sources. In particular, an unusually strong 4428 Å absorption feature is a common charateristic of fullerene PNe. Similar to Tc 1, the strongest optical bands of neutral C60 are not detected towards IC 418. Our high-quality (S/N > 300) spectra for PN Tc 1, together with its large radial velocity, permit us to search for the presence of diffuse bands of circumstellar origin, which we refer to as diffuse circumstellar bands (DCBs). We report the first tentative detection of two DCBs at 4428 and 5780 Å in the fullerene-rich circumstellar environment around the PN Tc 1. Laboratory and theoretical studies of fullerenes in their multifarious manifestations (carbon onions, fullerene clusters, or even complex species formed by fullerenes and other molecules like PAHs or metals) may help solve the mystery of some of the diffuse band carriers. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Astrochemistry en_US
dc.subject Line:identification en_US
dc.subject Circumstellar matter en_US
dc.subject ISM: molecules en_US
dc.subject Planetary nebulae: general en_US
dc.title A search for diffuse bands in fullerene planetary nebulae: evidence of diffuse circumstellar bands en_US
dc.type Article en_US

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