A dataset provided by the European Space Agency

Name DDT_dgarciah_3
Title Searching for complex fullerene-based molecules in the prototype fullerene Planetary Nebula IC 418
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342265942&instrument_name=PACS&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342265943&instrument_name=PACS&product_level=LEVEL0&compress=true

DOI https://doi.org/10.5270/esa-c5vfw5s
Author garcia-hernandez, d. a.
Description The recent and unexpected detection of the most common
fullerenes (C60 and C70) and proto-graphene in some
Planetary Nebulae (PNe) raises the exciting
possibility that other more complex fullerene-based
molecules (e.g., carbon onions or multishell
fullerenes, fullerene-adducts) might be ubiquitous in
the Universe and continue to be serious candidates to
explain many astrophysical phenomena. The presence of
complex fullerene-based molecules such as carbon
onions in the circumstellar shells of
fullerene-containing PNe is strongly suggested by our
recent analysis of the unusual diffuse interstellar
bands detected towards two PNe where C60 had already
been found. If complex fullerene-based molecules such
as carbon onions are present in this peculiar
class of stars, they could easily be detected in the
far-IR range. Fullerene-containing PNe are usually
very faint in the far-IR but our very recent detection
of C60 fullerenes in PN IC 418 can now mitigate this
unfortunate situation.

Surprisingly, Herschel has not observed this very
bright source - now considered the prototype
fullerene-containing PN - as part of any approved
program in previous cycles. Thus, a comprehensive
far-IR study of the complex circumstellar environment
where fullerenes and fullerene-based molecules may
form is at present lacking. With this DDT proposal
we aim at obtaining full range, high S/N,
Herschel/PACS far-IR spectra of PN IC 418 to search
for the spectral signatures of complex fullerene-based
molecules such as multishell fullerenes (e.g.,
C60@C240, C240@C960), which are predicted to be
detectable as relatively strong broad features in the
far-IR range. If successful, these observations will
constitute the first firm detection of the most
complex molecules ever detected in space. In addition,
we will search for... the predicted hydrogenated
amorphous carbon (HAC) associated feature at virgul60 um to
confirm/refute the HAC.s processing/decomposition
scenario as the preferred fullerene formation route in
PNe.
Publication THROES: a caTalogue of HeRschel Observations of Evolved Stars. I. PACS range spectroscopy . Ramos-Medina J. et al. . Astronomy & Astrophysics, Volume 611, id.A41, 38 pp. . 611 . 10.1051\/0004-6361\/201731940 . 2018A&A...611A..41R ,
Instrument PACS_PacsRangeSpec_point
Temporal Coverage 2013-03-04T21:07:10Z/2013-03-05T01:26:32Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-09-04T23:00:26Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, garcia-hernandez, d. a., 2013, DDT_dgarciah_3, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-c5vfw5s