Quarks and Compact Stars (QCS)
Oct. 20-22, 2014, KIAA at Peking University, Beijing - P. R. China


Poster

Cooling of Compact Stars with Color Superconducting Quark Matter

Tsuneo Noda

Kurume Institute of Technology

Abstract: We how a scenario for the cooling of compact stars considering the central source of Cassiopeia A (Cas A). The Cas A observation shows that the central source is a compact star with high effective temperature, and it is consistent with the cooling without exotic phases. The Cas A observation also gives the mass range of $M \geq 1.5 M_\odot$. It may conflict with the current cooling scenarios of compact stars that heavy stars show rapid cooling. Also, an accreting compact star SAX J1808 requires the strong cooling process, and the mass is not very large. If Cas A is heavier than SAX J1808, the strong cooling process is activated only in light stars. In the case of isolated stars, heavy stars indicate slow cooling, and light ones cool rapidly. We include the effect of the color superconducting quark matter phase on the thermal evolution of compact stars. We assume the gap energy of color superconducting quark phase is large ($\Delta \gtrsim \mathrm{10 MeV}$), and we simulate the cooling of compact stars. We present cooling curves obtained from the evolutionary calculations of compact stars: while heavier stars cool slowly, and lighter ones indicate the opposite tendency.