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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 816卷 / 02期

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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