Double-peaked [O i] Profile: A Likely Signature of the Gaseous Ring around KH 15D
Double-peaked [O i] Profile: A Likely Signature of the Gaseous Ring around KH 15D
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DOI：
10.3847/2041-8213/ab288d
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
M. Fang;I. Pascucci;J. Kim;S. Edwards
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文献类型：
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作者：
M. Fang;I. Pascucci;J. Kim;S. Edwards
KH 15D是一颗着名的光谱双星，因为它独特而戏剧性的光度变化。这种变化可以用环双星尘埃环来解释，但环本身从未被直接探测到。我们提出了一个新的解释双峰[O I] λ6300的轮廓起源于KH 15 D的热盘表面。通过模拟这些配置文件，我们测量的发射半径之间的0.5和5 Au，基本上是一个气体环非常相似的径向范围内推断的尘埃环从建模系统的光度变化。我们还讨论了外部光蒸发驱动的紫外光子从附近的大质量星星HD 47887截断的外边缘的观察值的可能性。
KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring, but the ring itself was never directly detected. We present a new interpretation of the double-peaked [O I] λ6300 profiles as originating from the hot disk surface of KH 15D. By modeling these profiles, we measure emitting radii between ∼0.5 and 5 au, basically a gaseous ring very similar in radial extent to the dust ring inferred from modeling the system’s photometric variability. We also discuss the possibility that external photoevaporation driven by ultraviolet photons from the nearby massive star HD 47887 has truncated the outer edge of the disk to the observed value.