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06 October 2024 |
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X-ray flares following short gamma-ray bursts from shock heating of binary stellar companions | | Andrew I. MacFadyen
; Enrico Ramirez-Ruiz
; Weiqun Zhang
; | | Date: |
6 Oct 2005 | | Subject: | astro-ph | | Affiliation: | Institute for Advanced Study, Princeton, KIPAC, Stanford | | Abstract: | The discovery of long-lasting (~100 s) X-ray flares following short gamma-ray bursts initially called into question whether they were truly classical short-hard bursts. Opinion over the last few years has coalesced around the view that the short-hard bursts arise from the merger of pairs of neutron stars, or a neutron star merging with a stellar-mass black hole. The natural timescales associated with these processes, however, essentially preclude an X-ray flare lasting ~100 s. Here we show that an interaction between the GRB outflow and a non-compact stellar companion at a distance of ~a light-minute provides a natural explanation for the flares. In the model, the burst is triggered by the collapse of a neutron star after accreting matter from the companion. This is reminiscent of type Ia supernovae, where there is a wide distribution of delay times between formation and explosion, leading to an association with both star-forming galaxies and old ellipticals. | | Source: | arXiv, astro-ph/0510192 | | Services: | Forum | Review | PDF | Favorites | |
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