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Simultaneous Triggered Collapse of the Presolar Dense Cloud Core and Injection of Short-Lived Radioisotopes by a Supernova Shock Wave | Alan P. Boss
; Sergei I. Ipatov
; Sandra A. Keiser
; Elizabeth A. Myhill
; Harri A. T. Vanhala
; | Date: |
18 Sep 2008 | Abstract: | Cosmochemical evidence for the existence of short-lived radioisotopes (SLRI)
such as $^{26}$Al and $^{60}$Fe at the time of the formation of primitive
meteorites requires that these isotopes were synthesized in a massive star and
then incorporated into chondrites within $sim 10^6$ yr. A supernova shock wave
has long been hypothesized to have transported the SLRI to the presolar dense
cloud core, triggered cloud collapse, and injected the isotopes. Previous
numerical calculations have shown that this scenario is plausible when the
shock wave and dense cloud core are assumed to be isothermal at $sim 10$ K,
but not when compressional heating to $sim 1000$ K is assumed. We show here
for the first time that when calculated with the FLASH2.5 adaptive mesh
refinement (AMR) hydrodynamics code, a 20 km/sec shock wave can indeed trigger
the collapse of a 1 $M_odot$ cloud while simultaneously injecting shock wave
isotopes into the collapsing cloud, provided that cooling by molecular species
such as H$_2$O, CO$_2$, and H$_2$ is included. These calculations imply that
the supernova trigger hypothesis is the most likely mechanism for delivering
the SLRI present during the formation of the solar system. | Source: | arXiv, 0809.3045 | Services: | Forum | Review | PDF | Favorites |
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