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Related papers: Decoding the message from meteoritic stardust sili…

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We present a model for the formation of silicon carbide aggregates within the expanding and cooling supernova remnant. Many SiC-X grains have been found to be aggregates of smaller crystals which are isotopically homogenous. The initial…

Solar and Stellar Astrophysics · Physics 2010-11-09 Ethan A. -N. Deneault

It is generally agreed that interstellar dust grains consist of two main components, namely, silicates and graphites. Some models, like MRN model, assume these grains to be homogeneous spheres following a power law size distribution. This…

Astrophysics of Galaxies · Physics 2009-03-30 Ashim K. Roy , Subodh K. Sharma , Ranjan Gupta

We present Spitzer IRS spectra of four carbon stars located in the Galactic Halo and the thick disc. The spectra display typical features of carbon stars with SiC dust emission and C$_2$H$_2$ molecular absorption. Dust radiative transfer…

Solar and Stellar Astrophysics · Physics 2015-06-11 Eric Lagadec , Greg. C. Sloan , Albert. A. Zijlstra , Nicolas Mauron , J. R. Houck

We construct size distributions for carbonaceous and silicate grain populations in different regions of the Milky Way, LMC, and SMC. The size distributions include sufficient very small carbonaceous grains (including polycyclic aromatic…

Astrophysics · Physics 2011-07-18 Joseph C. Weingartner , B. T. Draine

The formation and growth of refractory matter on pre-existing interstellar dust grain surfaces was studied experimentally by annealing neon-ice matrices in which potential precursors of silicate grains (Mg and Fe atoms, SiO and SiO$_2$…

Astrophysics of Galaxies · Physics 2020-04-08 Gaël Rouillé , Cornelia Jäger , Thomas Henning

Core-accretion planet formation begins in protoplanetary disks with the growth of small, ISM dust grains into larger particles. The progress of grain growth, which can be quantified using 10 micron silicate spectroscopy, has broad…

Solar and Stellar Astrophysics · Physics 2015-05-28 Andrew J. I. Skemer , Laird M. Close , Thomas P. Greene , Philip M. Hinz , William F. Hoffmann , Jared R. Males

We analyse observational correlations for three elements entering into the composition of interstellar silicate and oxide grains. Using current solar abundances (Asplund et al. 2009), we convert the gas-phase abundances into dust-phase…

Astrophysics of Galaxies · Physics 2015-05-18 N. V. Voshchinnikov , Th. Henning

For decades ever since the early detection in the 1990s of the emission spectral features of crystalline silicates in oxygen-rich evolved stars, there is a long-standing debate on whether the crystallinity of the silicate dust correlates…

Solar and Stellar Astrophysics · Physics 2017-01-25 Jiaming Liu , Biwei Jiang , Aigen Li , Jian Gao

The properties of interstellar dust grains are being scrutinized more than ever before, with the advent of large facilities. Infrared emission from dust grains is a powerful asset than can help constrain their physical and chemical…

The abundance of both amorphous and crystalline silicates in very small grains is limited by the fact that the 10 micron silicate emission feature is not detected in the diffuse ISM. On the basis of the observed IR emission spectrum for the…

Astrophysics · Physics 2009-10-31 Aigen Li , B. T. Draine

We report NanoSIMS Si and Mg-Al isotopic data (and C, N, and Ti isotopic data when available) for 85 submicron- to micron-sized presolar SiC grains from the CM2 Murchison meteorite, including 60 MS, 8 AB1, 8 X, 7 AB2, and 2 Y grains. The MS…

Solar and Stellar Astrophysics · Physics 2021-10-13 Nan Liu , Jens Barosch , Larry R. Nittler , Conel M. O D. Alexander , Jianhua Wang , Sergio Cristallo , Maurizio Busso , Sara Palmerini

Dust grains in the planet forming regions around young stars are expected to be heavily processed due to coagulation, fragmentation and crystallization. This paper focuses on the crystalline silicate dust grains in protoplanetary disks. As…

While it is well recognized that interstellar grains are made of amorphous silicates and some form of carbonaceous materials, it remains debated regarding what exact chemical and physical form the carbonaceous component takes. Contemporary…

Astrophysics of Galaxies · Physics 2015-06-19 Qi Li , S. L. Liang , Aigen Li

Hot accretion disks around massive protostars provide a unique opportunity to study ice-free silicate grains that cannot be investigated in protoplanetary disks. We conduct a self-consistent investigation into grain-size evolution and its…

Solar and Stellar Astrophysics · Physics 2025-08-26 Ryota Yamamuro , Kei E. I. Tanaka , Satoshi Okuzumi

Depletion studies provide a way to understand the chemical composition of interstellar dust grains. We here examine 23 gamma-ray bursts (GRB) optical afterglow spectra (spanning 0.6<z<5.0) and compare their silicon and iron dust-phase…

Astrophysics of Galaxies · Physics 2019-10-16 T. Zafar , K. E. Heintz , A. Karakas , J. Lattanzio , A. Ahmad , Macquarie Uni , Austalia , Uni. Iceland , Iceland , Monash Uni , Australia

The shock L1157-B1 driven by the low-mass protostar L1157-mm is an unique environment to investigate the chemical enrichment due to molecules released from dust grains. IRAM-30m and Plateau de Bure Interferometer observations allow a census…

The origin of carbon in the Universe remains uncertain. At solar metallicity, binary-stripped massive stars -- stars that lost their envelope through stable interaction with a companion -- have been suggested to produce twice as much carbon…

Solar and Stellar Astrophysics · Physics 2026-01-14 Jing-Ze Ma , Rob Farmer , Selma E. de Mink , Eva Laplace

The fine dust detected by IR emission around the nearby Beta Pic analogue star HD172555 is very peculiar. The dust mineralogy is composed primarily of highly refractory, non-equilibrium materials, with approximately three-quarters of the Si…

Solar and Stellar Astrophysics · Physics 2009-08-11 C. M. Lisse , C. H. Chen , M. C. Wyatt , A. Morlok , I. Song , G. Bryden , P. Sheehan

Astronomical observations and analysis of stardust isolated from meteorites have revealed a highly diverse interstellar and circumstellar grain inventory, including a wide range of amorphous materials and crystalline compounds (silicates…

Earth and Planetary Astrophysics · Physics 2022-06-06 A. G. G. M. Tielens
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