Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..509f&link_type=abstract
Publications of the Astronomical Society of Japan, vol.53, no. 3, p. 509-515
Astronomy and Astrophysics
Astronomy
11
Accretion, Accretion Disks, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General
Scientific paper
We have investigated nucleosynthesis in a supercritical accretion disk around a compact object of 1.4Msolar, using the self-similar solution of an optically thick advection dominated flow. Supercritical accretion is expected to occur in a supernova with fallback material accreting onto a new-born compact object. It has been found that appreciable nuclear reactions take place even for a reasonable value of the viscosity parameter, αvissimeq 0.01, when the accretion rate dot{m}=dot{M}c2/(16LEdd) > 105, where LEdd is the Eddington luminosity. If dot{m} ge 4 × 106, all heavy elements are destroyed to 4He through photodisintegrations at the inner part of the disk. Even 4He is also disintegrated to protons and neutrons near the inner edge when dot{m} ge 2 × 107. If the fallback matter of the supernova explosion has the composition of a helium-rich layer of the progenitor, a considerable amount of 44Ti could be ejected via a jet from the disk.
Arai Kenzo
Fujimoto Shin-ichirou
Hashimoto Masa-aki
Koike Osamu
Matsuba Ryuichi
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