THE DROP DURING LESS THAN 300 DAYS OF A DUSTY WHITE DWARF'S INFRARED LUMINOSITY
THE DROP DURING LESS THAN 300 DAYS OF A DUSTY WHITE DWARF'S INFRARED LUMINOSITY
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DOI：
10.1088/2041-8205/792/2/l39
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
Siyi Xu;M. Jura
中科院分区：
文献类型：
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作者：
Siyi Xu;M. Jura
我们报告了斯皮策/红外阵列相机对WD J 0959 - 0200的测光，WD J 0959 - 0200是一颗白色矮星，它显示出来自圆盘的过量红外辐射，可能是由潮汐破坏的星子产生的。结果表明，2010年，3.6 μm和4.5 μm波段的通量在不到300天的时间内均下降了约35%。红外光度的下降可能是由于两种情况之一的内盘半径的增加：（1）最近的小行星撞击;（2）星周盘的不稳定性。目前的情况是诱人的;高灵敏度，高节奏的红外研究将是一个新的工具，研究磁盘和它的主机白色矮星星星之间的相互作用。
We report Spitzer/Infrared Array Camera photometry of WD J0959−0200, a white dwarf that displays excess infrared radiation from a disk, likely produced by a tidally disrupted planetesimal. We find that in 2010, the fluxes in both 3.6 μm and 4.5 μm decreased by ∼35% in less than 300 days. The drop in the infrared luminosity is likely due to an increase of the inner disk radius from one of two scenarios: (1) a recent planetesimal impact; (2) instability in the circumstellar disk. The current situation is tantalizing; high-sensitivity, high-cadence infrared studies will be a new tool to study the interplay between a disk and its host white dwarf star.