Abstract
We investigate the element distribution in neutrino-dominated accretion flows around black holes with the proton-rich nuclear statistical equilibrium. According to our calculations, the radial nuclei distribution (around equatorial plane) is dominated by free nucleons, 4 He, and 56 Fe in the inner, middle, and outer region, respectively. For the vertical distribution, the heavy nuclei tend to be produced in a thin region near the disk surface, in which we find that 56 Ni is dominant for the flow with low accretion rate but it would switch to 56 Fe for high accretion rate. Our results imply that 56 Ni produced by central engine would tend to outflow and subsequently decay to drive the bumps observed in the light curves of the core collapse supernovae.
Highlights
A popular model for the central engine in gamma-ray bursts (GRBs) is based on the so-called neutrinodominated accretion flow (NDAFs, see, e.g., [1,2,3,4,5,6,7,8,9,10,11,12])
Supernova light curve bumps have been observed in the optical afterglow of some long-duration GRBs, which is driven by the decay of 56Ni [14]
We have described self-consistently how to produce 56Ni, 56Fe and other nuclei in the central region of GRBs with the NDAF model
Summary
A popular model for the central engine in gamma-ray bursts (GRBs) is based on the so-called neutrinodominated accretion flow (NDAFs, see, e.g., [1,2,3,4,5,6,7,8,9,10,11,12]). The extreme state is a hotbed to produce heavy nuclei and the central region of GRBs, is an ideal location to supply an extremely hot and dense state for nucleosynthesis, which should be involved in NDAF model. The purpose of this paper is to investigate the nuclei distribution in the radial and vertical directions of NDAFs with detailed neutrino physics and precise nuclear statistical equilibrium (NSE) [13]. The detailed equations already have been presented in [9] and [12]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
