论文标题
偶然发现WDJ181417.84-735459.83周围尘土飞扬的光盘
Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83
论文作者
论文摘要
对白矮人的光谱观察结果表明，其中许多是受外球星材料污染的，它们的散装组成可以通过这种方式进行唯一探测。我们提供了Da White Dwarf WDJ181417.84 $ - $ 735459.83的光谱和光度分析，该对象最初被确定为2量质量和明智的目录中有很大的红外过量，我们证实了我们对白色dwarf的固有性，并且可能对白色的dwarf进行了固有，并且可能与粉尘相关的是粉尘周围的粉尘，这是尘土周围的焦点。分开8年的白色矮人的两个X射击光谱中的Ca，Fe和Mg吸收线的发现进一步证明了尘土飞扬的碟片。我们没有报告这两个光谱之间的吸收线的可变性。将黑体模型拟合到红外过量的多余温度为910 $ \ pm50 $K。我们估计来自$ | \ dot {\ rm m} |的光谱金属线的总积分通量。 = 1.784 \ times 10^{9} \，$ g s $^{ - 1} $。
Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WDJ181417.84$-$735459.83, an object originally identified to have a strong infrared excess in the 2MASS and WISE catalogues that we confirmed to be intrinsic to the white dwarf, and likely corresponding to the emission of a dusty disc around the star. The finding of Ca, Fe and Mg absorption lines in two X-SHOOTER spectra of the white dwarf, taken 8 years apart, is further evidence of accretion from a dusty disc. We do not report variability in the absorption lines between these two spectra. Fitting a blackbody model to the infrared excess gives a temperature of 910$\pm50$ K. We have estimated a total accretion flux from the spectroscopic metal lines of $|\dot{\rm M}| = 1.784 \times 10^{9}\, $g s$^{-1}$.
