Journal Article

Magnetorotational Collapse of Population III Stars

Yudai Suwa, Tomoya Takiwaki, Kei Kotake and Katsuhiko Sato

in Publications of the Astronomical Society of Japan

Published on behalf of Astronomical Society of Japan

Volume 59, issue 4, pages 771-785
Published in print August 2007 | ISSN: 0004-6264
Published online August 2007 | e-ISSN: 2053-051X | DOI:
Magnetorotational Collapse of Population III Stars

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  • Astrometry and Celestial Mechanics
  • Astronomical Instrumentation, Methods, and Techniques
  • Stars


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We performed a series of two-dimensional magnetorotational core-collapse simulations of Population III stars. Changing the initial distributions of the rotation and magnetic fields prior to collapse in a parametric manner, we computed 19 models. By so doing, we systematically investigated how rotation and magnetic fields affect the collapse dynamics, and explored how the properties of black-hole formations and neutrino emissions could be affected. As for microphysics, we employed a realistic equation of state, and approximated neutrino transfer by a multiflavour leakage scheme. With these computations, we found that jet-like explosions are obtained by magneto-driven shock waves if the initial magnetic field is as large as [math]G. We point out that although the black-hole masses at formation decrease with the initial field strength, they increase with the initial rotation rates. As for the neutrino properties, we point out that the degree of differential rotation plays an important role in determining which species of the neutrino luminosity is more dominant than the others. Furthermore, we find that stronger magnetic fields make the peak neutrino luminosities smaller, because the magnetic pressure acts to halt collapse in the central regions, leading to a suppression of the releasable gravitational binding energies.

Keywords: supernovae: general; black hole physics; neutrinos; methods: numerical; magnetohydrodynamics (MHD)

Journal Article.  7433 words.  Illustrated.

Subjects: Astrometry and Celestial Mechanics ; Astronomical Instrumentation, Methods, and Techniques ; Stars

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