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Old 28-12-2017, 11:47 AM
gary
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Question Did the Solar System form in a Wolf-Rayet star bubble? - University of Chicago study

A 22 Dec 2017 paper appears in the Astrophysical Journey which puts
forward the theory that the Solar System was formed within the bubble
of a Wolf-Rayet star rather than having been created in a supernova.

The University of Chicago have made a press release.

Quote:
Originally Posted by University of Chicago
This setup differs from the supernova hypothesis in order to make sense of two isotopes that occur in strange proportions in the early solar system, compared to the rest of the galaxy. Meteorites left over from the early solar system tell us there was a lot of aluminium-26. In addition, studies, including a 2015 one by Dauphas and a former student, increasingly suggest we had less of the isotope iron-60.

This brings scientists up short, because supernovae produce both isotopes. “It begs the question of why one was injected into the solar system and the other was not,” said coauthor Vikram Dwarkadas, a research associate professor in Astronomy and Astrophysics.

This brought them to Wolf-Rayet stars, which release lots of aluminium-26, but no iron-60.

“The idea is that aluminum-26 flung from the Wolf-Rayet star is carried outwards on grains of dust formed around the star. These grains have enough momentum to punch through one side of the shell, where they are mostly destroyed—trapping the aluminum inside the shell,” Dwarkadas said. Eventually, part of the shell collapses inward due to gravity, forming our solar system.
Press release here :-
https://news.uchicago.edu/article/20...und-giant-star

"Triggered Star Formation inside the Shell of a Wolf–Rayet Bubble as the Origin of the Solar System" by Dwarkadas et. al. here (requires subscription) :-
http://iopscience.iop.org/article/10...38-4357/aa992e
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Old 28-12-2017, 01:10 PM
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astroron (Ron)
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Thanks Gary,that's very interesting
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