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Protostars and Planets
In recent years, astronomers have begun to discover an increasing number of planets orbiting stars outside our solar system. The characteristics and origins of these planetary bodies are the subject
Protostars and Planets VI
Various papers on the formation of stars and planets are presented. The general topics addressed include: molecular clouds and star formation, young stellar objects and circumstellar disks, chemistry
Aluminum‐26 in calcium‐aluminum‐rich inclusions and chondrules from unequilibrated ordinary chondrites
In order to investigate the distribution of ^(26)A1 in chondrites, we measured aluminum-magnesium systematics in four calcium-aluminum-rich inclusions (CAIs) and eleven aluminum-rich chondrules from
Modal abundances of CAIs: Implications for bulk chondrite element abundances and fractionations
Modal abundances of Ca,Al-rich inclusions (CAIs) are poorly known and reported data scatter across large ranges. CAIs are Poisson distributed, and if only small areas (<1000 mm2) are studied, the
Geo- and cosmochemistry of the twin elements yttrium and holmium
We have analyzed the Y/Ho-ratios in bulk chondrites, chondrules and four Ca- and Al-rich inclusions (CAIs) from carbonaceous and unequilibrated ordinary and enstatite chondrites (EC) by laser
NITROGEN AND CARBON ISOTOPIC COMPOSITION OF THE SUN INFERRED FROM A HIGH-TEMPERATURE SOLAR NEBULAR CONDENSATE
We report high-precision measurements of nitrogen and carbon isotopic compositions of a carbon-bearing titanium-nitride (osbornite) in a calcium-aluminum-rich inclusion (CAI) from the CH/CB-like
Origin and chronology of chondritic components: A review
Abstract Mineralogical observations, chemical and oxygen–isotope compositions, absolute 207Pb–206Pb ages and short-lived isotope systematics (7Be–7Li, 10Be–10B, 26Al–26Mg, 36Cl–36S, 41Ca–41K,
Amoeboid olivine aggregates and related objects in carbonaceous chondrites: records of nebular and asteroid processes
Amoeboid olivine aggregates (AOAs) are the most common type of refractory inclusions in CM, CR, CH, CV, CO, and ungrouped carbonaceous chondrites Acfer 094 and Adelaide; only one AOA was found in the
Supra-Canonical 26Al/27Al and the Residence Time of CAIs in the Solar Protoplanetary Disk
TLDR
Laser ablation and whole-rock multiple-collector inductively coupled plasma-source mass spectrometry magnesium isotope analyses of calcium- and aluminum-rich inclusions from CV3 meteorites demonstrate that some CAIs had initial 26Al/27Al values at least 25% greater than canonical and that the canonical initial 26 albedo cannot mark the beginning of solar system formation.
Evidence for Widespread 26Al in the Solar Nebula and Constraints for Nebula Time Scales
TLDR
The absence of 26Mg* from the decay of 26Al in Al-rich objects from unequilibrated ordinary chondrites indicates that the lifetime of the solar nebula over which CAIs and chondrules formed extended over ∼5 million years.
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