Proton-associated alpha-irradiation in the early solar system - A possible K-41 anomaly

1978 ◽  
Vol 221 ◽  
pp. 1026 ◽  
Author(s):  
E. Dwek
Keyword(s):  
Solar System ◽  
Early Solar System ◽  
System A ◽  
Alpha Irradiation ◽  
K 41

scholarly journals Short-Lived Nuclei in the Early Solar System: A Low Mass Stellar Source?

2003 ◽  
Vol 20 (4) ◽  
pp. 356-370 ◽  
Author(s):  
M. Busso ◽  
R. Gallino ◽  
G. J. Wasserburg
Keyword(s):  
Solar System ◽  
Asymptotic Giant Branch ◽  
Early Solar System ◽  
Uncertainty Range ◽  
System A ◽  
Free Decay ◽  
Low Mass ◽  
Stellar Source ◽  
Review Current

AbstractWe discuss possible stellar origins of short-lived radioactive nuclei with meanlife τ ≤ 100 Myr, which were shown to be alive in the Early Solar System (ESS). We first review current ideas on the production of nuclides having 10 ≤ τ ≤ 100 Myr, which presumably derive from the continuous interplay of galactic astration, nucleosynthesis from massive supernovae and free decay in the interstellar medium. The abundance of the shorter lived 53Mn might be explained by this same scenario. Then we consider the nuclei 107Pd, 26Al, 41Ca and 60Fe, whose early solar system abundances are too high to have originated in this way. Present evidence favours a stellar origin, particularly for 107Pd, 26Al and 60Fe, rather than an in situ production by energetic solar particles. The idea of an encounter (rather close in time and space) between the forming Sun and a dying star is therefore discussed: this star may or may not have also triggered the solar formation. Recent nucleosynthesis calculations for the yields of the relevant short-lived isotopes and of their stable reference nuclei are discussed. Massive stars evolving to type II supernovae (either leaving a neutron star or a black hole as a remnant) seem incapable of explaining the four most critical ESS radioactivities in their observed abundance ratios. An asymptotic giant branch (AGB) star seems to be a viable source, especially if of relatively low initial mass (M ≤ 3 M⊙) and with low neutron exposure: this model can provide a solution for 26Al, 41Ca and 107Pd, with important contributions to 60Fe, which are inside the present uncertainty range of the 60Fe early solar system abundance. Such a model requires that 26Al is produced substantially on the AGB by cool bottom processing. The remaining inventory of short-lived species in the solar nebula would then be attributed to the continuous galactic processing, with the exception of 10Be, which must reflect production by later proton bombardment at a low level during early solar history.

scholarly journals The Mg/Fe ratio of silicate minerals in the meteoritic materials and in the circumstellar environment: A case study for the chondritic-like composition

2021 ◽  
Vol 30 (1) ◽  
pp. 45-55
Author(s):  
Péter Futó ◽  
József Vanyó ◽  
Irakli Simonia ◽  
János Sztakovics ◽  
Mihály Nagy ◽  
...  
Keyword(s):  
Solar System ◽  
Crystallization Process ◽  
Planet Formation ◽  
Methodological Approach ◽  
Optical Microscope ◽  
Protoplanetary Disk ◽  
Early Solar System ◽  
System A ◽  
Circumstellar Environment

Abstract Kaba meteorite as a reference material (one of a least metamorphosed and most primitive carbonaceous chondrites fell on Earth) was chosen for this study providing an adequate background for study of the protoplanetary disk or even the crystallization processes of the Early Solar System. Its olivine minerals (forsterite and fayalite) and their Mg/Fe ratio can help us to understand more about the planet formation mechanism and whether or not the metallic constitutes of the disk could be precursors for the type of planets in the Solar System. A multiple methodological approach such as a combination of the scanning electron microscope, optical microscope, Raman spectroscopy and electron microprobe of the olivine grains give the Fe/Mg ratio database. The analyses above confirmed that planet formation in the protoplanetary disk is driven by the mineralogical precursors of the crystallization process. On the other hand, four nebulae mentioned in this study provide the astronomical data confirming that the planet formation in the protoplanetary disk is dominated or even driven by the metallic constituents.

scholarly journals The Moon as a Recorder of Organic Evolution in the Early Solar System: A Lunar Regolith Analog Study

Astrobiology ◽  
2015 ◽  
Vol 15 (2) ◽  
pp. 154-168 ◽  
Author(s):  
Richard Matthewman ◽  
Richard W. Court ◽  
Ian A. Crawford ◽  
Adrian P. Jones ◽  
Katherine H. Joy ◽  
...  
Keyword(s):  
Solar System ◽  
Lunar Regolith ◽  
The Moon ◽  
Early Solar System ◽  
Organic Evolution ◽  
System A ◽  
Analog Study
Sign in / Sign up

Export Citation Format

Share Document