EVIDENCE FOR GAS FROM A DISINTEGRATING EXTRASOLAR ASTEROID

被引:88
作者
Xu, S. [1 ]
Jura, M. [2 ]
Dufour, P. [3 ]
Zuckerman, B. [2 ]
机构
[1] European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[3] Univ Montreal, Inst Rech Exoplanetes iREx, Montreal, PQ H3C 3J7, Canada
基金
美国国家科学基金会;
关键词
circumstellar matter; minor planets; asteroids:; general; stars: abundances; stars: individual (WD 1145+017); white dwarfs; RICH WHITE-DWARFS; PLANETARY DEBRIS; ACCRETION; DISKS; FREQUENCY;
D O I
10.3847/2041-8205/816/2/L22
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report high-resolution spectroscopic observations of WD 1145+017-a white dwarf that was recently found to be transitted by multiple asteroid-sized objects within its tidal radius. We discovered numerous circumstellar absorption lines with linewidths of similar to 300 km s(-1) from Mg, Ca, Ti, Cr, Mn, Fe, and Ni, possibly from several gas streams produced by collisions among the actively disintegrating objects. The atmosphere of WD 1145+017 is polluted with 11 heavy elements, including O, Mg, Al, Si, Ca, Ti, V:, Cr, Mn, Fe, and Ni. Evidently, we are witnessing the active disintegration and subsequent accretion of an extrasolar asteroid.
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页数:6
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