Results 11 to 20 of about 2,942 (252)
Origin of isolated olivine grains in carbonaceous chondrites [PDF]
Meteoritics & Planetary Science, 2020 AbstractWe report microscopic, cathodoluminescence, chemical, and O isotopic measurements of FeO‐poor isolated olivine grains (IOG) in the carbonaceous chondrites Allende (CV3), Northwest Africa 5958 (C2‐ung), Northwest Africa 11086 (CM2‐an), and Allan Hills 77307 (CO3.0).
Jacquet, Emmanuel +3 more
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ÆSOPUS 2.0: Low-temperature Opacities with Solid Grains
The Astrophysical Journal, 2023 In this study we compute the equation of state and Rosseland mean opacity from temperatures of T ≃ 30,000 K down to T ≃ 400 K, pushing the capabilities of the Æ SOPUS code into the regime where solid grains can form.
Paola Marigo +5 more
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Simulation of Infrared Spectra of Carbonaceous Grains [PDF]
The Astrophysical Journal, 1997 Random covalent network (RCN) theory is applied to describe the infrared spectroscopic properties of carbonaceous solids with compositions containing a mixture of aromatic, aliphatic, and diamond-like hydrocarbons. Application of this technique to carbonaceous dust is equivalent to the synthesis of solids whose structure and bonding satisfy ...
G. Dadswell, W. W. Duley
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Luminescence from Small Carbonaceous Dust Grains [PDF]
Symposium - International Astronomical Union, 1990 A relationship exists between the amount of the ultraviolet (UV) extinction and the relative strength of the very broad structure (VBS) in the 500–600 nm wavelength region (5000–6000 Å) of the interstellar extinction curve. It is based on observations of OB stars distributed along the Milky Way.
Christian Friedemann, Hans-Georg Reimann
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Gold in ash and slag material of the Primorsk hydroelectric power [PDF]
E3S Web of Conferences, 2020 The paper shows the results of studies on the identification of noble-metal mineralization in various components of ash and slag formations: underburning, aluminosilicate microspheres, initial ash (fed to the magnetic separation of the technological ...
Lavrik Natalia, Henning Peter
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The Astrophysical Journal, 2023 Molecules and particles make up ∼40%–70% of carbon in the interstellar medium, yet the exact chemical structure of these constituents remains unknown. We present carbon K-shell absorption spectroscopy of the Galactic interstellar medium obtained with the
John Staunton, Frits Paerels
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Did a Complex Carbon Cycle Operate in the Inner Solar System?
Life, 2020 Solids in the interstellar medium consist of an intimate mixture of silicate and carbonaceous grains. Because 99% of silicates in meteorites were reprocessed at high temperatures in the inner regions of the Solar Nebula, we propose that similar levels of
Joseph A. Nuth +3 more
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Grain Alignment and Rotational Disruption by Radiative Torques in Exoplanet Atmospheres
The Astrophysical Journal, 2023 Dust clouds are ubiquitous in the atmospheres of hot Jupiters and affect their observable properties. The alignment of dust grains in the clouds and resulting dust polarization provide a promising way to study the magnetic fields of exoplanets. Moreover,
Thiem Hoang, Alex Lazarian
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Carbonaceous dust grains seen in the first billion years of cosmic time
Nature, 2023 AbstractLarge dust reservoirs (up to approximately 108 M⊙) have been detected1–3in galaxies out to redshiftz ≃ 8, when the age of the Universe was only about 600 Myr. Generating substantial amounts of dust within such a short timescale has proven challenging for theories of dust formation4,5and has prompted the revision of the modelling of potential ...
Witstok, Joris +41 more
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Thermal fluctuations and nanoscale effects in the nucleation of carbonaceous dust grains [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 10 pages, submitted to MNRAS, comments ...
Adam C. Keith, Davide Lazzati
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