SIX WHITE DWARFS WITH CIRCUMSTELLAR SILICATES

被引：89
作者：
Jura, M. [1 ,2 ]
Farihi, J. [3 ]
Zuckerman, B. [1 ,2 ]
机构：
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Ctr Astrobiol, Los Angeles, CA 90095 USA
[3] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
来源：
ASTRONOMICAL JOURNAL | 2009年 / 137卷 / 02期
关键词：
minor planets; asteroids; planetary systems; white dwarfs; EXCESS INFRARED RADIATION; SPITZER-SPACE-TELESCOPE; DUSTY DISK; WARM DUST; INTERSTELLAR-MEDIUM; DEBRIS DISKS; ACCRETION; PLANET; GD-362; ABUNDANCES;
D O I：
10.1088/0004-6256/137/2/3191
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Spitzer Space Telescope spectra reveal 10 mu m silicate emission from circumstellar dust orbiting six externally polluted white dwarfs. Micron-size glasses with an olivine stoichiometry can account for the distinctively broad wings that extend to 12 mu m; these particles likely are produced by tidal disruption of asteroids. The absence of infrared polycyclic aromatic hydrocarbon features is consistent with a scenario where extrasolar rocky planets are assembled from carbon-poor solids.
引用
收藏
页码：3191 / 3197
页数：7
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