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Double Degenerate Stars |
| LUO Xin-Lian1,2, BAI Hua1, ZHAO Lei1 |
| 1Department of Astronomy, Nanjing University, Nanjing 2100932Center for Gravitational Wave Astronomy, University of Texas at Brownsville, TX 78520, US |
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| Cite this article: |
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LUO Xin-Lian, BAI Hua, ZHAO Lei 2008 Chin. Phys. Lett. 25 2378-2381 |
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Abstract Regardless of the formation mechanism, an exotic object, the double degenerate star (DDS), is introduced and investigated, which is composed of baryonic matter and some unknown fermion dark matter. Different from the simple white dwarfs (WDs), there is additional gravitational force provided by the unknown fermion component inside DDSs, which may strongly affect the structure and the stability of such kind of objects. Many possible and strange observational phenomena connecting with them are concisely discussed. Similar to the normal WD, this object can also experience thermonuclear explosion as type Ia supernova explosion when DDS's mass exceeds the maximum mass that can be supported by electron degeneracy pressure. However, since the total mass of baryonic matter can be much lower than that of WD at Chandrasekhar mass limit, the peak luminosity should be much dimmer than what we expect before, which may throw a slight shadow on the standard candle of SN Ia in the research of cosmology.
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| Keywords:
04.40.Dg
97.20.Rp
97.60.Bw
97.60.Jd
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Received: 26 March 2008
Published: 26 June 2008
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| PACS: |
04.40.Dg
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(Relativistic stars: structure, stability, and oscillations)
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97.20.Rp
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(Faint blue stars (including blue stragglers), white dwarfs, degenerate stars, nuclei of planetary nebulae)
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97.60.Bw
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(Supernovae)
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97.60.Jd
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(Neutron stars)
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