混合等熵双星

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Universe Pub Date : 2024-08-23 DOI:10.3390/universe10090336
Juan Pablo Carlomagno, Gustavo A. Contrera, Ana Gabriela Grunfeld, David Blaschke
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引用次数: 0

摘要

我们对在有限温度下具有彩色超导夸克物质内核的混合中子星进行了研究,研究结果表明,在恒星序列中,每个重子的熵是恒定的(s/nB=const)。对于夸克物质的状态方程,我们采用了最近开发的非局部手性夸克模型,而核物质则用 DD2 类相对论密度泛函模型来描述。相变是在等温条件下通过麦克斯韦构造获得的。我们发现,在相图中低 s/nB≲2 的轨迹上穿越混合相会产生加热效应,而在较大 s/nB 时温度会下降。这种行为可能是由于在低温下存在彩色超导夸克物质相,而在高温下二夸克凝聚物熔化,恢复了正常的夸克物质相。虽然低 s/nB≲2 时的等熵混合星分支与中子星分支相连,但在每重子熵值较高时,它就会断开,从而出现 "热孪生 "现象。我们发现,从连接到断开的混合星序列的转变可以用能量密度差的塞多夫准则来估算。开始发生解聚时的半径和质量呈现线性关系,因此定义了等熵恒星构型的临界紧密度,在此临界紧密度下会发生过渡,而且对于足够大的 s/nB≳2 值,过渡会伴随着不稳定性。这项研究的结果可能与利用夸克去抵消机制揭示大质量蓝超巨星超新星可爆炸性的条件有关。吸积诱导的去抵消转变与热孪生的形成可能有助于解释某些双星系统偏心轨道的起源和孤立毫秒脉冲星的起源。
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Hybrid Isentropic Twin Stars
We present a study of hybrid neutron stars with color superconducting quark matter cores at a finite temperature that results in sequences of stars with constant entropy per baryon, s/nB=const. For the quark matter equation of state, we employ a recently developed nonlocal chiral quark model, while nuclear matter is described with a relativistic density functional model of the DD2 class. The phase transition is obtained through a Maxwell construction under isothermal conditions. We find that traversing the mixed phase on a trajectory at low s/nB≲2 in the phase diagram shows a heating effect, while at larger s/nB the temperature drops. This behavior may be attributed to the presence of a color superconducting quark matter phase at low temperatures and the melting of the diquark condensate which restores the normal quark matter phase at higher temperatures. While the isentropic hybrid star branch at low s/nB≲2 is connected to the neutron star branch, it becomes disconnected at higher entropy per baryon so that the “thermal twin” phenomenon is observed. We find that the transition from connected to disconnected hybrid star sequences may be estimated with the Seidov criterion for the difference in energy densities. The radii and masses at the onset of deconfinement exhibit a linear relationship and thus define a critical compactness of the isentropic star configuration for which the transition occurs and which, for large enough s/nB≳2 values, is accompanied by instability. The results of this study may be of relevance for uncovering the conditions for the supernova explodability of massive blue supergiant stars using the quark deconfinement mechanism. The accretion-induced deconfinement transition with thermal twin formation may contribute to explaining the origin of eccentric orbits in some binary systems and the origin of isolated millisecond pulsars.
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来源期刊
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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