论文标题
磁性白矮人的局部热核突发
Localised thermonuclear bursts from accreting magnetic white dwarfs
论文作者
论文摘要
Nova爆炸是由在积聚白矮人的表面层中触发的全球热核逃亡者引起的。已经预测，在白色矮人上的局部热核突发也可能发生，类似于在积聚中子恒星中观察到的I型X射线爆发。在过去的$ \ \ 40 $ $ \ 40 $的情况下，已经观察到了多次观察到了几年的二进制电视哥伦布（TV Columbae）二进制电视哥伦布的快速爆发。在这些爆发期间，光学/紫外线发光度在不到一个小时的时间内增加了$> 3 $，并且淡出了$ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ houderbusy of。在紫外线光谱线上观察到了快速流出，速度$> 3500 $ km s $^{ - 1} $，与逃逸速度从白色矮人表面相媲美。在这里，我们报告了在电视哥伦布以及其他两个积累系统中观察到的光爆发，ei ursae majoris和asassn-19bh。爆发的总能量$ \ 〜〜10^{ - 6} $是经典的Nova爆炸（“ MicroNovae”），并且与I型X射线爆发非常相似。我们将积聚或出色的磁重新连接事件作为其起源，并建议在磁性积聚柱中的热核失控事件作为可行的解释。
Nova explosions are caused by global thermonuclear runaways triggered in the surface layers of accreting white dwarfs. It has been predicted that localised thermonuclear bursts on white dwarfs can also take place, similar to Type I X-ray bursts observed in accreting neutron stars. Unexplained rapid bursts from the binary system TV Columbae, in which mass is accreted onto a moderately-strong magnetised white dwarf from a low-mass companion, have been observed on several occasions in the past $\approx40$ years. During these bursts the optical/UV luminosity increases by a factor of $>3$ in less than an hour and fades over $\approx10$ hours. Fast outflows have been observed in UV spectral lines, with velocities $>3500$ km s$^{-1}$, comparable to the escape velocity from the white dwarf surface. Here we report on optical bursts observed in TV Columbae as well as in two additional accreting systems, EI Ursae Majoris and ASASSN-19bh. The bursts have a total energy $\approx~10^{-6}$ those of classical nova explosions ("micronovae"), and bear a strong resemblance to Type I X-ray bursts. We exclude accretion or stellar magnetic reconnection events as their origin and suggest thermonuclear runaway events in magnetically-confined accretion columns as a viable explanation.
