BRIGHT “MERGER-NOVA” FROM THE REMNANT OF A NEUTRON STAR BINARY MERGER: A SIGNATURE OF A NEWLY BORN, MASSIVE, MILLISECOND MAGNETAR
BRIGHT “MERGER-NOVA” FROM THE REMNANT OF A NEUTRON STAR BINARY MERGER: A SIGNATURE OF A NEWLY BORN, MASSIVE, MILLISECOND MAGNETAR
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DOI：
10.1088/2041-8205/776/2/l40
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Yun-Wei Yu;Bing Zhang;He Gao
中科院分区：
文献类型：
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作者：
Yun-Wei Yu;Bing Zhang;He Gao
一颗巨大的毫秒磁星可能会在中子星（NS）双星的合并中幸存下来，这将持续为合并喷射提供动力。我们建立了一个具有中心磁星能量注入的合并抛射的通用动力学模型。由磁星紫外波段的峰值和光曲线的峰值所驱动的喷射物（“合并新星”），随着频率的增加，逐渐转移到更早的时期。磁动力合并新星的光学峰值亮度可以与超新星相媲美，后者比放射性动力合并新星（所谓的大新星或千新星）亮几十倍或数百倍。另一方面，这样的合并新星会比超新星更早达到峰值，持续时间也要短得多。磁星的早期坍缩可能会抑制光发射的亮度并缩短其持续时间。这种毫秒磁驱动的合并新星可能在没有观测到短伽马射线暴的情况下从NS-NS合并事件中被探测到，并且可能是由NS-NS合并引起的引力波爆发的明亮电磁对应体。如果探测到，它表明合并留下了一个巨大的NS，这对核物质的状态方程具有重要意义。
A massive millisecond magnetar may survive the merger of a neutron star (NS) binary, which would continuously power the merger ejecta. We develop a generic dynamic model for the merger ejecta with energy injection from the central magnetar. The ejecta emission (the “merger-nova”) powered by the magnetar peaks in the UV band and the peak of the light curve, progressively shifts to an earlier epoch with increasing frequency. A magnetar-powered merger-nova could have an optical peak brightness comparable to a supernova, which is a few tens or hundreds times brighter than the radioactive-powered merger-novae (the so-called macro-nova or kilo-nova). On the other hand, such a merger-nova would peak earlier and have a significantly shorter duration than that of a supernova. An early collapse of the magnetar could suppress the brightness of the optical emission and shorten its duration. Such millisecond-magnetar-powered merger-novae may be detected from NS–NS merger events without an observed short gamma-ray burst, and could be a bright electromagnetic counterpart for gravitational wave bursts due to NS–NS mergers. If detected, it suggests that the merger leaves behind a massive NS, which has important implications for the equation-of-state of nuclear matter.