Accretion-Induced Conversion of High-Velocity Neutron Stars to Strange Stars in Supernovae and Implications for Gamma-Ray Bursts

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dc.creatorCheng, K. S.
dc.creatorDai, Z. G.
dc.date2001-05-10
dc.date.accessioned2026-07-07T01:58:33Z
dc.date.available2026-07-07T01:58:33Z
dc.descriptionWe present a new model for gamma-ray bursts (GRBs) that are not only associated with supernovae but also have small baryon contamination. In this model, we assume a newborn neutron star to move outward at a kick velocity of $\sim 10^3 {\rm km} {\rm s}^{-1}$ in the supernova ejecta. We find that such a neutron star still hypercritically accretes its surrounding supernova matter. Once the stellar mass increases to some critical mass, the neutron star will undergo a phase transition to become a strange star, leading to an energy release of a few $10^{52}$ ergs. The phase transition, if possibly occuring just near the supernova front, will first result in an ultra-relativistic fireball and then a GRB. This provides a plausible explanation for the GRB-supernova association. We estimate the burst rate to be $\sim 10^{-6}$ per year per galaxy. Our model also predicts other possiblities. For example, if the resulting fireballs have a Lorentz factor of the order of a few, they will produce X-ray GRBs observed by BeppoSAX. We find the rate of such bursts to be $\sim 10^{-5}$ per year per galaxy.
dc.description11 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/astro-ph/0105164
dc.identifierhttp://arxiv.org/abs/astro-ph/0105164
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2757
dc.subjectAstrophysics
dc.titleAccretion-Induced Conversion of High-Velocity Neutron Stars to Strange Stars in Supernovae and Implications for Gamma-Ray Bursts
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