Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328–1219
Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328–1219
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DOI：
10.3847/1538-4357/ac0822
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发表时间：
2021-06
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通讯作者：
Z. Vanderbosch;S. Rappaport;J. A. Guidry;B. Gary;S. Blouin;Thomas G. Kaye;A. Weinberger;C. Melis;B. Klein;B. Zuckerman;A. Vanderburg;J. Hermes;R. Hegedus;M. Burleigh;R. Sefako;H. Worters;T. Heintz
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作者：
Z. Vanderbosch;S. Rappaport;J. A. Guidry;B. Gary;S. Blouin;Thomas G. Kaye;A. Weinberger;C. Melis;B. Klein;B. Zuckerman;A. Vanderburg;J. Hermes;R. Hegedus;M. Burleigh;R. Sefako;H. Worters;T. Heintz
我们给出了ZTFJ0328−1219的后续光度和光谱分析，加强了它作为一颗显示凌日行星碎片的白矮星的地位。使用TESS和兹维基瞬变设施测光技术，以及来自各个天文台的后续高速测光技术，我们发现了9.937和11.2时两个显著的变化期的证据。我们将其解释为最有可能是不同碎片团的轨道周期。在夜间、每周和每月的时间尺度上，可以观察到光曲线中详细的倾角结构的变化，这让人想起第一颗被发现藏匿着一颗正在解体的小行星WD 1145+017的白矮星的动态行为。我们结合已发表的光谱和宽带测光技术得到了这颗白矮星的新大气参数：M⋆=0.731±0.023 M⊙，T Ef=7630±140K，[Ca/He]=−9.55±0.12。利用新的高分辨率光谱，我们探测到了可能起源于星周的显著而狭窄的Na-D吸收特征，速度相对于大气谱线蓝移了2 1.4±1.0 km S−1。我们将周期性调制的光度信号归因于小行星或彗星等小型轨道天体的尘埃流出物，但我们无法识别最有可能被升华或以其他方式抛射的物质，因为环境温度大约在400K到700K之间。
We present follow-up photometry and spectroscopy of ZTF J0328−1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transient Facility photometry, along with follow-up high-speed photometry from various observatories, we find evidence for two significant periods of variability at 9.937 and 11.2 hr. We interpret these as most likely the orbital periods of different debris clumps. Changes in the detailed dip structures within the light curves are observed on nightly, weekly, and monthly timescales, reminiscent of the dynamic behavior observed in the first white dwarf discovered to harbor a disintegrating asteroid, WD 1145+017. We fit previously published spectroscopy along with broadband photometry to obtain new atmospheric parameters for the white dwarf, with M ⋆ = 0.731 ± 0.023 M ⊙, T eff = 7630 ± 140 K, and [Ca/He] = − 9.55 ± 0.12. With new high-resolution spectroscopy, we detect prominent and narrow Na D absorption features likely of circumstellar origin, with velocities 21.4 ± 1.0 km s−1 blueshifted relative to atmospheric lines. We attribute the periodically modulated photometric signal to dusty effluents from small orbiting bodies such as asteroids or comets, but we are unable to identify the most likely material that is being sublimated, or otherwise ejected, as the environmental temperatures range from roughly 400 to 700 K.