I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
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DOI：
10.3847/1538-4357/abee68
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发表时间：
2021-05-01
影响因子：
4.9
通讯作者：
Kuehne, J. W.
中科院分区：
文献类型：
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作者：
Guidry, Joseph A.;Vanderbosch, Zachary P.;Kuehne, J. W.
我们提出了一种新的方法来检测变量天体物理对象和瞬态现象使用异常过量散射重复测量从公共目录的盖亚DR 2和Zwicky瞬态设施（ZTF）DR 3测光。我们首先提供了一个广义的，全天空代理的变化，只使用盖亚DR 2测光，校准到白色矮星。为了确保更鲁棒的候选检测，我们进一步采用了Gaia与ZTF测光和警报相结合的方法。为了证明其有效性，我们将后一种技术应用于以CZ Ceti不稳定带为中心的200 pc范围内的大约12，100个白色矮星的样本，其中氢-大气白色矮星已知会脉动。通过检查这些方法排名前1%的样本，我们证明了仅Gaia和ZTF通知技术在识别已知和新的可变白色矮星方面非常有效，我们使用后续高速测光进行了验证。我们确认了在我们排名最高的1%候选者中观察到的33个（100%）白色矮星中的所有33个（100%）的变异性，无论是在鲸鱼座ZZ不稳定带的内部还是外部。除了几十个新的脉动白色矮星，我们还确定了五个白色矮星极有可能显示过境行星碎片;如果得到证实，这些系统将超过三倍的白色矮星已知的主机过境碎片。
We present a novel method to detect variable astrophysical objects and transient phenomena using anomalous excess scatter in repeated measurements from public catalogs of Gaia DR2 and Zwicky Transient Facility (ZTF) DR3 photometry. We first provide a generalized, all-sky proxy for variability using only Gaia DR2 photometry, calibrated to white dwarf stars. To ensure more robust candidate detection, we further employ a method combining Gaia with ZTF photometry and alerts. To demonstrate its efficacy, we apply this latter technique to a sample of roughly 12,100 white dwarfs within 200 pc centered on the ZZ Ceti instability strip, where hydrogen-atmosphere white dwarfs are known to pulsate. By inspecting the top 1% of the samples ranked by these methods, we demonstrate that both the Gaia-only and ZTF-informed techniques are highly effective at identifying known and new variable white dwarfs, which we verify using follow-up, high-speed photometry. We confirm variability in all 33 out of 33 (100%) observed white dwarfs within our top 1% highest-ranked candidates, both inside and outside the ZZ Ceti instability strip. In addition to dozens of new pulsating white dwarfs, we also identify five white dwarfs highly likely to show transiting planetary debris; if confirmed, these systems would more than triple the number of white dwarfs known to host transiting debris.