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- · arXiv e-print (arXiv:1105.1495)
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| Title: |
| Quark-Novae in Low-Mass X-ray Binaries as a model for G87-7 and for GRB 110328A |
| Authors: |
| Ouyed, Rachid; Staff, Jan E.; Jaikumar, Prashanth |
| Publication: |
| eprint arXiv:1105.1495 |
| Publication Date: |
| 05/2011 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 4 journal pages. Related animations at: http://quarknova.ucalgary.ca/media/ |
| Bibliographic Code: |
| 2011arXiv1105.1495O |
Abstract
We propose a simple model explaining two outstanding astrophysical problems related to compact objects: (1) that of stars such as G87-7 (alias EG 50) that constitute a class of relatively low-mass white dwarfs which nevertheless fall away from the C/O composition and (2) that of GRB 110328A/Swift J164449.3+57345 which showed spectacularly long-lived strong X-ray flaring, posing a challenge to standard GRB models. We argue that both these observations may have an explanation within the unified framework of a Quark-Nova occurring in a low-mass X-ray binary (neutron star-white dwarf). For LMXBs where the binary separation is sufficiently tight, ejecta from the Neutron Star triggers nuclear burning in the white dwarf on impact, leading to alpha-rich and Fe-rich composition compact white dwarfs reminiscent of G87-7. Under slightly different conditions, the white dwarf is ablated and its ashes raining down on the Quark star leads to accretion-driven X-ray luminosity with energetics and duration reminiscent of GRB 110328A. We predict additional flaring activity towards the end of the accretion phase if the Quark star turns into a Black Hole.
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