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Article
The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects
Knowledge of the surface temperature distribution on a comet’s nucleus and its temporal evolution at different timescales is key to constraining its thermophysical properties and understanding the physical pro...
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Article
Exposed water ice on the nucleus of comet 67P/Churyumov–Gerasimenko
Using infrared wavelengths, micrometre-sized water-ice grains have been identified on the nucleus (which is mostly coated in a dark material) of comet 67P/Churyumov–Gerasimenko.
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Article
A dynamic upper atmosphere of Venus as revealed by VIRTIS on Venus Express
ESA's Venus Express probe has been in orbit since April 2006. Eight research papers in this issue present new results from the mission, covering the atmosphere, polar features, interactions with the solar wind...
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Article
South-polar features on Venus similar to those near the north pole
ESA's Venus Express probe has been in orbit since April 2006. Eight research papers in this issue present new results from the mission, covering the atmosphere, polar features, interactions with the solar wind...
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Article
Variability of Circumstellar Emission from Dust Envelopes Around Carbon Stars
The main constituents of the dust, produced around late-type carbon stars, are thought to be carbon and silicon carbide (SiC), although their exact nature is not yet well established. This subject has been add...
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Chapter and Conference Paper
Variability of Circumstellar Emission from Dust Envelopes around Carbon Stars
The main constituents of the dust, produced around late-type carbon stars, are thought to be carbon and silicon carbide (SiC), although their exact nature is not yet well established. This subject has been add...
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Article
Variability of Circumstellar Emission from Dust Envelopes Around Carbon Stars
The main constituents of the dust, produced around late-type carbon stars, are thought to be carbon and silicon carbide (SiC), although their exact nature is not yet well established. This subject has been add...
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Article
The fir emission of dust particles around c-rich IRAS sources
The spectra of 26 IRAS sources have been fitted using experimental optical data obtained in our laboratory for different types of carbon and silicon carbide (SiC) submicronic particles. Laboratory data are the...
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Chapter and Conference Paper
The Fir Emission of Dust Particles around C-Rich IRAS Sources
The spectra of 26 IRAS sources have been fitted using experimental optical data obtained in our laboratory for different types of carbon and silicon carbide (SiC) submicronic particles. Laboratory data are the...
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Article
Silicon carbide in laboratory, in interstellar space and in the solar system
Using theoretical models and our laboratory data on different dust mixtures containing silicon carbide grains, we obtained the best fit of several infrared emission spectra of carbon stars and comets. The resu...
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Article
Laboratory study of silicates and application to cometary dust
The mass absorption coefficients of some glassy and crystalline silicates of astrophysical relevance have been measured. We produced and characterized also synthetic silicates of olivine type since this materi...
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Chapter and Conference Paper
Laboratory Spectra of Amorphous and Crystalline Olivine: An Application to Comet Halley IR Spectrum
Among the various silicates proposed as components of cosmic dust grains, olivine is considered one of the most likely materials. In this work we present the infrared spectra of three different types of olivin...
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Article
Amorphous carbon and carbonaceous materials in space
We present here a fitting of the spectrum of the carbon star GL799, obtained using a mixture of amorphous carbon (AC) and silicon carbide (SiC) grains. We have also interpreted the 3.4 μm band of Comet Halley,...
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Chapter and Conference Paper
Carbonaceous Solid Materials: From Laboratory to Space
We present here an updated review of laboratory results obtained from different carbonaceous materials in grain and molecular forms. Temperature behaviour of bands falling between 3 µm and 13 µm is reported for s...
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Article
Amorphous carbon and carbonaceous materials in space
We present here the most recent measurements (UV and Raman spectroscopy) carried out on carbonaceous materials candidates as cosmic dust.
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Chapter and Conference Paper
Experimental Evidences for HAC and PAHs Soup in Space
Since its discovery in the spectrum of NGC 7027, the family of weak IR bands, the so called unidentified IR bands (hereinafter UIR), has been found in emission in a wide variety of galactic and extragalactic s...
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Chapter and Conference Paper
Amorphous Carbon and Silicon Carbide Grains Around Carbon Stars
It is well known that a large amount of dust (~ 40%) is produced in the envelopes of late-type stars (Jura, 1985). Moreover, according to Knapp and Morris (1985) a very important contribution to this amount (a...
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Chapter and Conference Paper
Solid Carbon in Space
Interstellar grains represent an important constituent of matter in space. They are necessary to the cooling and heating mechanisms and play an important role in the gas phase composition of molecular clouds. ...
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Article
Amorphous carbon around carbon stars
In this paper we present the results of a simplified model to determine the flux emerging from dust envelopes around cool stars. The model proposed holds under the hypotheses of negligible scattering effects a...
