标题： HESS J1731-347中的中心致密天体是否是具有夸克核的混合星？ 基于恒定声速参数化的分析 显示英文标题

标题： Is the central compact object in HESS J1731-347 a hybrid star with a quark core? An analysis with the constant speed of sound parametrization

摘要： 在这项工作中，我们研究了HESS J1731-347中的致密天体是否可能是具有内核夸克物质的混合星的可能性，并使用$M=0.77_{-0.17}^{+0.20}M_{\odot}$和$R=10.4_{-0.78}^{+0.86} km$。对该低质量致密星的观测表明需要采用较软的状态方程，但该状态方程却无法解释大质量致密星。这为天体物理学家在寻找致密天体状态方程的过程中提出了新的挑战。混合状态方程是基于相对论平均场（RMF）理论的IUFSU参数化方法和夸克物质相变时的通用常数声速参数化（CSS）构建的。CSS框架由三个关键参数表征，即转变密度$(\rho_{tr})$、能量跳跃$(\Delta\varepsilon)$和声速$(C_s)$。在这里，我们的主要目标是研究单独的CSS参数对形成与HESS J1731-347参数兼容的小质量和半径物体的影响。我们也考察了诸如有效质量、对称能以及饱和密度下对称能斜率等强子参数对这种致密天体形成的影响。最终，我们的分析表明，在1$\sigma$可信度水平内，HESS J1731-347与早期脱禁闭且更高能隙的稳定混合星情景一致。 显示英文摘要

摘要： In this work, we investigate the possibility of the compact object in HESS J1731-347 with $M=0.77_{-0.17}^{+0.20}M_{\odot}$ and $R=10.4_{-0.78}^{+0.86} km$ to be a hybrid star with quark matter in the inner core. The observation of this low mass compact star dictates the use of softer equation of state which on the contrary cannot explain the massive compact stars. This poses a new challenge for the astrophysicists in their search for the equation of state of compact objects. The hybrid equations of state are constructed using the IUFSU parametrization based on the relativistic mean field (RMF) theory for the hadronic part and the generic constant speed of sound parametrization (CSS) for the phase transition to quark matter.The CSS framework is characterized by three key parameters, namely the transition density $(\rho_{tr})$, the energy jumps $(\Delta\varepsilon)$ and the speed of sound $(C_s)$. Here, our primary aim is to investigate the influence of individual CSS parameters on the formation of a object of small mass and radius compatible with HESS J1731-347 parameters. We have also examined the effect of hadronic parameters such as effective mass, symmetry energy, and the slope of the symmetry energy at saturation densities on the formation of this compact object.Finally our analysis suggests that, within a 1$\sigma$ credible level, HESS J1731-347 aligns with the scenario of a stable hybrid star with early deconfinement and higher energy gap