TRIGGERING COLLAPSE OF THE PRESOLAR DENSE CLOUD CORE AND INJECTING SHORT-LIVED RADIOISOTOPES WITH A SHOCK WAVE. I. VARIED SHOCK SPEEDS

2009/11/17 by Alan P. Boss, Sandra A. Keiser, С. И. Ипатов +4
Physics and Astronomy · #Astro and Planetary Science #Astrophysics #Astrophysics and Star Formation Studies #Core (optical fiber) #Gamma-ray bursts and supernovae #Gravitational collapse #Mechanics #Optics #Physics #Shock (circulatory) #Shock wave #Supernova #astro-ph.EP

paper · pdf · doi:10.1088/0004-637x/708/2/1268

published as Astrophys.J.708:1268-1280,2010 · 39 pages, 14 figures. in press, ApJ

arxiv created 2009/11/17 · openalex publication_date 2009/12/22 · arxiv updated 2014/11/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The discovery of decay products of a short-lived radioisotope (SLRI) in the Allende meteorite led to the hypothesis that a supernova shock wave transported freshly synthesized SLRI to the presolar dense cloud core, triggered its self-gravitational collapse, and injected the SLRI into the core.Previous multidimensional numerical calculations of the shock-cloud collision process showed that this hypothesis is plausible when the shock wave and dense cloud core are assumed to remain isothermal at ∼10 K, but not when compressional heating to ∼1000 K is assumed.Our two-dimensional models with the FLASH2.5 adaptive mesh refinement hydrodynamics code have shown that a 20 km s -1 shock front can simultaneously trigger collapse of a 1 M core and inject shock wave material, provided that cooling by molecular species such as H 2 O, CO, and H 2 is included.Here, we present the results for similar calculations with shock speeds ranging from 1 km s -1 to 100 km s -1 .We find that shock speeds in the range from 5 km s -1 to 70 km s -1 are able to trigger the collapse of a 2.2 M cloud while simultaneously injecting shock wave material: lower speed shocks do not achieve injection, while higher speed shocks do not trigger sustained collapse.The calculations continue to support the shock-wave trigger hypothesis for the formation of the solar system, though the injection efficiencies in the present models are lower than desired.

Citations

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