Results 11 to 20 of about 27,054 (290)

Internal and External Alignment of Carbonaceous Grains within the Radiative Torque Paradigm

The Astrophysical Journal, 2023
We study the internal and external alignment of carbonaceous grains in the interstellar medium (ISM) within the Radiative Torque (RAT) paradigm.
Thiem Hoang, Vo Hong Minh Phan, Le Ngoc Tram   +2 more
doaj   +5 more sources

Thermal fluctuations and nanoscale effects in the nucleation of carbonaceous dust grains [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We investigate the role of thermal fluctuations and of the finite number of monomers in small clusters of carbon atoms on the nucleation rate of carbonaceous grains. Thermal fluctuations are due to the quantized nature of the energy exchanges between the
Keith, Adam C., Lazzati, Davide
core   +3 more sources

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, Shivaei, Irene, Smit, Renske, Maiolino, Roberto, Carniani, Stefano, Curtis-Lake, Emma, Ferruit, Pierre, Arribas, Santiago, Bunker, Andrew J, Cameron, Alex J, Charlot, Stephane, Chevallard, Jacopo, Curti, Mirko, De Graaff, Anna, D'Eugenio, Francesco, Giardino, Giovanna, Looser, Tobias J, Rawle, Tim, Rodríguez Del Pino, Bruno, Willott, Chris, Alberts, Stacey, Baker, William M, Boyett, Kristan, Egami, Eiichi, Eisenstein, Daniel J, Endsley, Ryan, Hainline, Kevin N, Ji, Zhiyuan, Johnson, Benjamin D, Kumari, Nimisha, Lyu, Jianwei, Nelson, Erica, Perna, Michele, Rieke, Marcia, Robertson, Brant E, Sandles, Lester, Saxena, Aayush, Scholtz, Jan, Sun, Fengwu, Tacchella, Sandro, Williams, Christina C, Willmer, Christopher NA   +41 more
openaire   +11 more sources

Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu [PDF]

Nature Communications
Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended ...
Bradley De Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, Corentin Le Guillou, Larry R. Nittler, Jens Barosch, Hikaru Yabuta, Zita Martins, Yoko Kebukawa, Taiga Okumura, Minako Hashiguchi, Shohei Yamashita, Yasuo Takeichi, Yoshio Takahashi, Daisuke Wakabayashi, Cécile Engrand, Laure Bejach, Lydie Bonal, Eric Quirico, Laurent Remusat, Jean Duprat, Maximilien Verdier-Paoletti, Smail Mostefaoui, Mutsumi Komatsu, Jérémie Mathurin, Alexandre Dazzi, Ariane Deniset-Besseau, Emmanuel Dartois, Yusuke Tamenori, Hiroki Suga, Gilles Montagnac, Kanami Kamide, Miho Shigenaka, Megumi Matsumoto, Yuma Enokido, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda   +58 more
doaj   +2 more sources

Ab-initio dynamic study of mechanisms for dust-mediated molecular hydrogen formation in space [PDF]

Communications Chemistry
The reason for the abundance of molecular hydrogen (H2) in space remains unresolved. Here we study collision dynamics under spacelike conditions to test H2 formation mechanisms where carbonaceous dust grains may have a catalytic role.
Yuzhen Guo, David R. McKenzie
doaj   +2 more sources

Structure and evolution of interstellar carbonaceous dust. Insights from the laboratory

Frontiers in Astronomy and Space Sciences, 2022
A large fraction of interstellar carbon is locked up in solid grains. The nature, origin and evolution of these grains have been investigated for decades.
Víctor J. Herrero, Miguel Jiménez-Redondo, Miguel Jiménez-Redondo, Ramón J. Peláez, Belén Maté, Isabel Tanarro   +5 more
doaj   +1 more source

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, Piralla, Maxime, Kersaho, Pauline, Marrocchi, Yves   +3 more
openaire   +3 more sources

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, Peter Woitke, Emanuele Tognelli, Léo Girardi, Bernhard Aringer, Alessandro Bressan   +5 more
doaj   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source