Searching for strange quark matter objects among white dwarfs

Physics Letters B

Hong-Shi Zong¹  Yong-Feng Huang²  Jin-Jun Geng³  Abdusattar Kurban⁴ 

[1] Corresponding author at: Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, People's Republic of China.;School of Astronomy and Space Science, Nanjing University, Nanjing 210023, Jiangsu, People's Republic of China;Xinjiang Key Laboratory of Radio Astrophysics, Urumqi 830011, Xinjiang, People's Republic of China;Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, People's Republic of China;

关键词: Compact objects;    Strange quark matter;    Strange quark stars;   

DOI  :  

来源: DOAJ

【 摘 要 】

The ground state of matter may be strange quark matter (SQM), not hadronic matter. A whole sequence of SQM objects, ranging from strange quark stars and strange quark dwarfs to strange quark planets, can stably exist according to this SQM hypothesis. A strange dwarf has a mass similar to that of a normal white dwarf, but could harbor an extremely dense SQM core (with the density as large as ∼4×1014gcm−3) at the center so that its radius can be correspondingly smaller. In this study, we try to search for strange dwarfs among the observed “white dwarfs” by considering their difference in the mass-radius relation. Seven strange dwarf candidates are identified in this way, whose masses are in the range of ∼0.02–0.12M⊙, with the radii narrowly distributed in ∼9,000–15,000 km. The seven objects are LSPM J0815+1633, LP 240-30, BD+20 5125B, LP 462-12, WD J1257+5428, 2MASS J13453297+4200437, and SDSS J085557.46+053524.5. Comparing with white dwarfs of similar mass, these candidates are obviously smaller in radius. Further observations with large radio/infrared/optical telescopes on these interesting candidates are solicited.

【 授权许可】

Unknown