EX draconis: using eclipses to separate outside-in and inside-out outbursts

EX draconis: using eclipses to separate outside-in and inside-out outbursts
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EX draconis:利用日食来区分由外向内和由内向外的爆发

DOI:
10.1093/mnras/staa1042
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发表时间:
2020
影响因子:
4.8
通讯作者:
Court J
Court J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Court J

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本文介绍了TESSCycles 14和15期间吸积的白色矮星EX Dra的食的研究。在这个数据集中出现的两次爆发期间,日食在日食深度/日食外通量空间中经历了一个滞后循环。在每一种情况下,执行循环的方向强烈地表明在吸积盘的内边缘附近触发并向外传播的爆发。这反过来又表明,在EX Dra的爆发是“内向外”的爆发;事件预测的矮新星吸积盘以前的流体动力学研究,并证实了光谱在其他一些吸积白色矮系统。因此,我们建议,在日食深度/出日食通量空间执行的循环的方向被用来作为一个测试,以区分“内出”和“外在”爆发在其他食矮新星的现象,一个可靠的和纯粹的光度测试,以区分这些现象。
We present a study of the eclipses in the accreting white dwarf EX draconis (EX Dra) duringTESSCycles 14 and 15. During both of the two outbursts present in this data set, the eclipses undergo a hysteretic loop in eclipse-depth/out-of-eclipse-flux space. In each case, the direction in which the loops are executed strongly suggests an outburst that is triggered near the inner edge of the accretion disc and propagates outwards. This in turn suggests that the outbursts in EX Dra are ‘inside out’ outbursts; events predicted by previous hydrodynamic studies of dwarf nova accretion discs and confirmed spectroscopically in a number of other accreting white dwarf systems. We therefore propose that the direction of the loop executed in eclipse-depth/out-of-eclipse flux space be used as a test to phenomenologically distinguish between ‘inside out’ and ‘outside in’ outbursts in other eclipsing dwarf novae; a reliable and purely photometric test to differentiate between these phenomena.
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