Dead zone formation and non-steady hyperaccretion in collapsar disks
نویسندگان
چکیده
منابع مشابه
Dead Zone Formation and Nonsteady Hyperaccretion in Collapsar Disks : a Possible Origin of Short-term Variability in the Prompt Emission of Gamma-ray Bursts
The central engine of gamma-ray bursts (GRBs) is believed to be a hot and dense disk with hyperaccretion onto a few solar mass black hole. We investigate where magnetorotational instability (MRI) actively operates in the hyperaccretion disk, which can cause angular momentum transport in disks. The inner region of the hyperaccretion disk can become neutrino opaque, and the energy and momentum tr...
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Winds blown from collapsar accretion disks may produce observable stellar explosions independent of any GRB-(and afterglow)-producing jets which may be simultaneously produced. The production of winds is controlled by the accretion disk physics, in particular, the nature of disk cooling via neutrino emission and photodisintegration of heavy nuclei. These temperature-dependent processes depend o...
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It is usually proposed that hyperaccretion disks surrounding stellar-mass black holes at an accretion rate of a fraction of one solar mass per second, which are produced during the mergers of double compact stars or the collapses of massive stars, are central engines of gamma-ray bursts (GRBs). In some origin/afterglow models, however, newborn compact objects are invoked to be neutron stars rat...
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The magnetorotational instability across the dead zone of protoplanetary disks
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We argue that gravitational instability in the outer parts of collapsar disks may lead to fragmentation near the radius where helium photodisintegrates, because of the strong cooling provided by this process. This physics sets clear physical scales for the fragmentation conditions and the properties of gravitationally bound clumps. Collapse of a fragment proceeds until the neutrons become degen...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2008
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921309030269