论文标题
通过震动的地震余震中的前体耀斑中的准周期性振荡
Quasi-periodic oscillations in precursor flares via seismic aftershocks from resonant shattering
论文作者
论文摘要
GRB 211211a伴随着Kilonova，这意味着该活动的合并起源。在主排放之前，还看到了由$ \ 22 \，\ mbox {hz} $调制的前体耀斑，该耀斑在$ \ 22 \，\ mbox {hz} $上调节。这里建议的是，前体是由一颗恒星在聚结之前的谐振造成的。在这种情况下，地震余震和低频扭转模式可能会从破裂部位散发出来，从而解释了潜在的振荡。这种解释直接类似于软伽马中将的巨型耀斑的提案，在该提案中，已经观察到在相似频率下的振荡，涉及星际夸克，然后是地壳振动。计算扭转模式特性，以在一般相对论中缓慢旋转，磁性中子星的序列。 $ \大约22 \，\ mbox {hz} $调制符合nodeless的调制，$ \ ell = 2 $ torsional模式，用于各种恒星参数。全球或离散的AlfVén模式也是可行的候选人。
GRB 211211A was accompanied by a kilonova, implying a merger origin for the event. A precursor flare, modulated by quasi-periodic oscillations at $\approx 22\, \mbox{Hz}$, was also seen $\approx 1\, \mbox{s}$ prior to the main emission. It is suggested here that the precursor resulted from the resonant shattering of one star's crust prior to coalescence. Seismic aftershocks and low-frequency torsional modes may emanate from the rupture site in this case, explaining the underlying oscillations. This interpretation is directly analogous to proposals for giant flares from soft gamma repeaters, where oscillations at similar frequencies have been observed, involving starquakes followed by crustal vibrations. Torsional mode properties were computed for sequences of slowly rotating, magnetised neutron stars in general relativity. The $\approx 22\, \mbox{Hz}$ modulations in the precursor matches that of nodeless, $\ell =2$ torsional modes for a wide variety of stellar parameters. Global or discrete Alfvén modes are also viable candidates.
