Stellar explosions powered by black hole accretion
| Autor: | A. I. MacFadyen |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Stellar rotation Stellar collision Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Compact star Accretion (astrophysics) Black hole Intermediate-mass black hole Stellar mass loss Astrophysics::Solar and Stellar Astrophysics Stellar black hole Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | AIP Conference Proceedings. |
| ISSN: | 0094-243X |
| DOI: | 10.1063/1.1291718 |
| Popis: | The fate of massive (Mms≳25 M⊙) rotating stars for which the Type-II supernova mechanism fails to launch a strong explosion is studied by means of 1D and 2D hydrodynamical simulations. In the extreme case (Mms≳35 M⊙) a collapsar-a rapidly accreting (Ṁ≈0.1 M⊙ s−1) stellar mass black hole at the center of a collapsing star-forms promptly. Here we study the alternative case of weak to moderately energetic supernova explosions in rotating stars. For explosion energies (at infinity) in the range 0.2−1.7×1051 erg, part of the exploding stellar mantle (0.1−5 M⊙) fails to reach terminal escape velocity and accretes onto the central compact object. Accretion rates of 10−2−10−6 M⊙ s−1 result over time scales of 100-100,000 s. Since the accreting gas has sufficient angular momentum to form an accretion disk around the central black hole, a jet engine similar to currently favored GRB engine models forms within an extended stellar envelope. 2D modeling demonstrates the propagation of the ensuing jet-driven explosion t... |
| Databáze: | OpenAIRE |
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