Quark star matter at finite temperature

Abstract

We have investigated the properties of strange quark matter and quark stars at finite temperature within the confined isospin-density-dependent mass (CIDDM) model. The newly discovered heavy compact stars PSR $\mathrm{J}0348+0432$ ($2.01\ifmmode\pm\else\textpm\fi{}0.04\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$) and MSP $\mathrm{J}0740+6620$ ($2.14{\ifmmode\pm\else\textpm\fi{}}_{0.09}^{0.10}\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ of 68.3% credibility interval and $2.14{\ifmmode\pm\else\textpm\fi{}}_{0.18}^{0.20}\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ of 95.4% credibility interval) can be well described as quark stars with large quark matter symmetry energy within the CIDDM model in this work. In particular, we also calculate the properties of the protoquark stars (PQSs) at the heating and cooling stages along the star evolution line, and we find that the tidal deformability of PQSs increases with temperature in the heating stages within the CIDDM model.