Double Degenerate Stars  

作　　者：罗新炼 白华 赵磊 

机构地区：[1]Department of Astronomy, Nanjing University, Nanjing 210093 [2]Center for Gravitational Wave Astronomy, University of Texas at Brownsville, TX 78520, US

出　　处：《Chinese Physics Letters》2008年第7期2378-2381,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10221001. LUO Xin-lian would like thank the hospitality of the Center for Gravitational Wave Astronomy at UTB, where some of the work was performed. The authors wish to thank an anonymous referee for his valuable suggestions.

摘　　要：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 totM 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.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 totM 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.

关 键 词：the power-law exponents PRECIPITATION durative abrupt precipitation change 

分 类 号：O57[理学—粒子物理与原子核物理] P1[理学—物理]