Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating-猫眼课题宝

DOI：

10.3847/2041-8213/ad243c

发表时间：

2024-02

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

K. Iłkiewicz;S. Scaringi;M. Veresvarska;D. de Martino;C. Littlefield;C. Knigge;J. Paice;A. Sahu

大变星可以经历短暂的光学变亮，这通常归因于矮新星爆发、微新星、供体耀斑或磁门爆发等现象。由于这些事件表现出相似的观测特征，它们的识别往往是模糊的。特别是，磁门爆发和微新星被认为是对同一现象的另一种解释。在这里，我们证明了时间尺度和能量将光学增亮分离成与其不同分类一致的单独的星团。这表明微新星和磁门爆发实际上是不同的现象。根据我们的发现，我们开发了诊断图，可以根据它们的特性区分这些爆发/耀斑。我们在新发现的中间极性CTCV J0333-4451的观测中证明了这种方法的有效性，我们将其归类为磁门控系统。CTCV J0333-4451是具有磁门控的自旋轨道周期比第三高的中间极性星系，这表明这些爆发在这些罕见的星系中很常见。

Cataclysmic variables can experience short optical brightenings, which are commonly attributed to phenomena such as dwarf novae outbursts, micronovae, donor flares, or magnetic gating bursts. Since these events exhibit similar observational characteristics, their identification has often been ambiguous. In particular, magnetic gating bursts and micronovae have been suggested as alternative interpretations of the same phenomena. Here we show that the timescales and energies separate the optical brightenings into separate clusters consistent with their different classifications. This suggests that micronovae and magnetic gating bursts are in fact separate phenomena. Based on our findings, we develop diagnostic diagrams that can distinguish between these bursts/flares based on their properties. We demonstrate the effectiveness of this approach on observations of a newly identified intermediate polar, CTCV J0333-4451, which we classify as a magnetic gating system. CTCV J0333-4451 is the third highest spin-to-orbital period ratio intermediate polar with magnetic gating, suggesting that these bursts are common among these rare systems.

Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating

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