RADIO TRANSIENTS FROM ACCRETION-INDUCED COLLAPSE OF WHITE DWARFS
RADIO TRANSIENTS FROM ACCRETION-INDUCED COLLAPSE OF WHITE DWARFS
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DOI：
10.3847/2041-8205/830/2/l38
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
T. Moriya
中科院分区：
文献类型：
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作者：
T. Moriya
我们研究了无线电频率下白矮星（WDs）吸积诱导塌缩（AIC）的观测特性。如果AIC是由伴星的吸积触发的，那么在祖星系周围可以形成致密的星周介质。然后，AIC的喷出物与密集的星周介质碰撞，产生强烈的冲击。强烈的冲击可以产生同步辐射，可以在无线电频率中观察到。即使AIC是由于WD合并而发生的，我们认为如果满足一定条件，AIC可能会导致快速射电暴（frb）。如果AIC形成的中子星（NSs）质量太大，需要旋转来支撑自己（即超大质量NSs），超大质量NSs可能会立即因r模不稳定性而失去旋转能量并坍缩成黑洞。如果坍缩的超大质量NSs被强烈磁化，它们可能像之前提出的那样发射快速射电暴。单简并系统的AIC射电瞬变可能在未来的甚大阵巡天或平方公里阵射电瞬变巡天中被探测到。由于AIC被认为是引力波（GWs）的一个来源，来自AIC的引力波可能伴随着无线电亮瞬变，可以用来确认观测到的GWs的AIC起源。
We investigate observational properties of accretion-induced collapse (AIC) of white dwarfs (WDs) in radio frequencies. If AIC is triggered by accretion from a companion star, a dense circumstellar medium can be formed around the progenitor system. Then, the ejecta from AIC collide with the dense circumstellar medium, creating a strong shock. The strong shock can produce synchrotron emission that can be observed in radio frequencies. Even if AIC occurs as a result of WD mergers, we argue that AIC may cause fast radio bursts (FRBs) if a certain condition is satisfied. If AIC forms neutron stars (NSs) that are so massive that rotation is required to support themselves (i.e., supramassive NSs), the supramassive NSs may immediately lose their rotational energy by the r-mode instability and collapse to black holes. If the collapsing supramassive NSs are strongly magnetized, they may emit FRBs, as previously proposed. The AIC radio transients from single-degenerate systems may be detected in future radio transient surveys like the Very Large Array Sky Survey or the Square Kilometer Array transient survey. Because AIC has been proposed as a source of gravitational waves (GWs), GWs from AIC may be accompanied by radio-bright transients that can be used to confirm the AIC origin of observed GWs.