A SUPRAMASSIVE MAGNETAR CENTRAL ENGINE FOR GRB 130603B
A SUPRAMASSIVE MAGNETAR CENTRAL ENGINE FOR GRB 130603B
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DOI：
10.1088/2041-8205/779/2/l25
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Yizhong Fan;Yun-Wei Yu;Dong Xu;Z. Jin;Xuefeng Wu;D. Wei;Bing Zhang
中科院分区：
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作者：
Yizhong Fan;Yun-Wei Yu;Dong Xu;Z. Jin;Xuefeng Wu;D. Wei;Bing Zhang
我们发现，奇特的早期光发射，特别是X射线余辉发射的短持续时间爆发GRB 130603 B可以解释连续能量注入到爆炸波从超大质量磁星中央引擎。观察到的晚红外凸起的能量学和时间/光谱特性（即，“kilonova”）也被发现与中子星星（NS）-NS合并期间发射的喷出物的排放一致，并由磁星中央发动机提供动力。伽马射线暴（GRB）爆炸波和千诺瓦的各向同性等效动能约为Ek = 1051 erg，与由近各向同性磁星风提供动力一致。然而，这个相对较小的值要求磁星的大部分初始旋转能量（大约几× 1052 erg）被引力波辐射带走。结果表明：（1）GRB 130603 B的前身星是一个NS-NS双星系统，其合并产物是一个持续时间约为1000 s的超大质量NS，（2）核物质状态方程必须足够硬，才能允许长寿命的超大质量NS存在;因此，这表明，在即将到来的高级LIGO/VIRGO时代，在没有短GRB关联的情况下探测引力波触发器的明亮电磁对应物是有希望的。
We show that the peculiar early optical emission and, in particular, the X-ray afterglow emission of the short-duration burst GRB 130603B can be explained by continuous energy injection into the blastwave from a supramassive magnetar central engine. The observed energetics and temporal/spectral properties of the late infrared bump (i.e., the “kilonova”) are also found to be consistent with emission from the ejecta launched during a neutron star (NS)–NS merger and powered by a magnetar central engine. The isotropic-equivalent kinetic energies of both the gamma-ray burst (GRB) blastwave and the kilonova are approximately Ek ∼ 1051 erg, consistent with being powered by a near-isotropic magnetar wind. However, this relatively small value requires that most of the initial rotational energy of the magnetar (∼a few × 1052 erg) is carried away by gravitational wave radiation. Our results suggest that (1) the progenitor of GRB 130603B was a NS–NS binary system, the merger product of which would have been a supramassive NS that lasted for about ∼1000 s; (2) the equation of state of the nuclear matter should be stiff enough to allow the survival of a long-lived supramassive NS; thus this suggested that the detection of the bright electromagnetic counterparts of gravitational wave triggers without short GRB associations is promising in the upcoming Advanced LIGO/VIRGO era.