Results 31 to 40 of about 536 (176)
Progress in Earth and Planetary Science, 2022 Enstatite chondrites are a small clan of meteorites, only ~ 1% out of all meteorite collection. However, they are the most reduced meteorites and have almost identical isotopic compositions to those of the Earth, suggestive of significant contributions ...
Yangting Lin
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Breathing Life Into Dead-Zones
EPJ Web of Conferences, 2013 The terrestrial planet formation regions of protoplanetary disks are generally sufficiently cold to be con- sidered non-magnetized and, consequently, dynamically inactive.
Gressel Oliver +2 more
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Isolating Dust and Free–Free Emission in ONC Proplyds with ALMA Band 3 Observations
The Astrophysical Journal, 2023 The Orion Nebula Cluster (ONC) hosts protoplanetary disks experiencing external photoevaporation by the cluster’s intense UV field. These “proplyds” are comprised of a disk surrounded by an ionization front.
Nicholas P. Ballering +8 more
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Mechanical Modification of Chondrule Fine-grained Rims by Dusty Nebular Shocks
The Planetary Science Journal, 2023 The mechanical processes that convert an initially fluffy chondrule fine-grained rim (FGR) into a more compact structure remain poorly characterized.
Augusto Carballido +3 more
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The Integral Field View of the Orion Nebula
Advances in Astronomy, 2014 This paper reviews the major advances achieved in the Orion Nebula through the use of integral field spectroscopy (IFS). Since the early work of Vasconcelos and collaborators in 2005, this technique has facilitated the investigation of global properties ...
Adal Mesa-Delgado
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Origin of Low-26Al/27Al Corundum/Hibonite Inclusions in Meteorites
The Astrophysical Journal, 2023 Most meteoritic calcium-rich, aluminum-rich inclusions formed from a reservoir with ^26 Al/ ^27 Al ≈ 5 × 10 ^−5 , but some record lower ${({}^{26}\mathrm{Al}/{}^{27}\mathrm{Al})}_{0}$ , demanding they sampled a reservoir without live ^26 Al.
Steven J. Desch +7 more
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The Astrophysical Journal, 2023 We continue to investigate long-term protoplanetary disk evolution and focus on the situation of strong disk self-gravity (DSG). We call such a disk a type III disk. A large amount of mass is stored in the disk due to large angular momentum.
Xin-Ming Wang
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Herschel/HIFI observations of molecular emission in protoplanetary nebulae and young planetary nebulae [PDF]
Astronomy & Astrophysics, 2011 We performed Herschel/HIFI observations of intermediate-excitation molecular lines in the far-infrared/submillimeter range in a sample of ten protoplanetary nebulae and young planetary nebulae. The high spectral resolution provided by HIFI yields accurate measurements of the line profiles.
Gary J. Melnick +23 more
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Fullerenes, PAHs, Amino Acids and High Energy Astrophysics
Acta Polytechnica CTU Proceedings, 2014 We present theoretical, observational and laboratory work on the spectral properties of fullerenes and hydrogenated fullerenes. Fullerenes in its various forms (individual, endohedral, hydrogenated, etc.) can contribute to the UV bump in the extinction ...
Susana Iglesias-Groth
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Mid-infrared spectroscopy of protoplanetary and planetary nebulae [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We present medium-resolution (R ∼600), mid-infrared (7.5-14 μm) spectra of 15 young planetary nebulae. Linestrengths for observed forbidden transitions are presented, and numerous broad emission features from silicates, polyaromatic hydrocarbons (PAHs) and silicon carbide (SiC) are observed.
John C. Wilson +3 more
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