Prompt Subsidence of a Proto--Neutron Star into a Black Hole
Prompt Subsidence of a Proto--Neutron Star into a Black Hole
复制标题
原中子星迅速沉入黑洞
DOI：
10.1086/176007
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
I. Towner
中科院分区：
文献类型：
--
作者：
A. Hayes;I. Towner
在中微子损失之前，新形成的质子中子星将由中子、质子、电子、介子和在这种情况下处于最低能量状态的捕获中微子的电荷中性混合物组成。然而，在几秒钟内，中微子会逃逸，使恒星内部找到更低的能量。我们研究了两种可能性：(1)大量重子将通过弱相互作用转变为超子。(2)强子物质在内部压力高的地方可能转变为夸克物质。在任何一种情况下，得到的较软的状态方程都不能支持大范围的恒星，无论是质量还是重子数。因此，除了上述任何一个平衡序列的重子数之外，还有很大范围的质子中子星在中微子损失后不具有流体静力学稳定构型。它们会在中微子损失的时间尺度上，大约10秒，在前超新星恒星的加工物质被喷射出来之后，沉入黑洞。关于基态的两种可能性中哪一种实际成立的不确定性主要是由于对冷电荷中性重子物质的夸克物质相的不完善描述。我们讨论了这些机制与SN1987 a中子星的明显缺失和中子星-超新星关联的可能缺失有关。
A newly formed protoneutron star, prior to the loss of neutrinos, will con sist of a charge-neutral mixture of neutrons, protons, electrons, muons and trapped neutrinos in the lowest energy state available under these circum stances. However, in a few seconds, the neutrinos will escape, enabling the interior of the star to find a lower energy. We study two possibilities: (1) A significant number of baryons will, through the weak interaction, convert to hyperons. (2) Hadronic matter may convert to quark matter in the interior where the pressure is high. In either case the resulting softer equation of state will not support as large a range of stars either in mass or baryon number. Therefore, beyond the baryon number of either of the above equilibrated sequences there is a significant range of protoneutron stars that possess no hydrostatically stable configurations after neutrino loss. They will subside into a black hole on the time-scale of neutrino loss, about ten seconds, and after the processed material of the presupernova star has been ejected. The uncertainty as to which of the two possibilities for the ground state actually holds is due mainly to the imperfect descrip tion available for the quark matter phase of cold charge-neutral baryonic matter. We discuss these mechanisms in connection with the apparent absence of a neutron star in SN1987 A and the possible deficit of neutron star - supernova associations .