Low-temperature crystallization of silicate dust in circumstellar disks

被引:164
作者
Molster, FJ
Yamamura, I
Waters, LBFM
Tielens, AGGM
de Graauw, T
de Jong, T
de Koter, A
Malfait, K
van den Ancker, ME
van Winckel, H
Voors, RHM
Waelkens, C
机构
[1] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands
[2] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Heverlee, Belgium
[3] SRON, Lab Space Res Groningen, NL-9700 AV Groningen, Netherlands
[4] SRON, Space Res Lab, NL-3584 CA Utrecht, Netherlands
[5] Univ Utrecht, Astron Inst, NL-3508 TA Utrecht, Netherlands
关键词
D O I
10.1038/44085
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Silicate dust in the interstellar medium is observed to be amorphous(1), yet silicate dust in comets(2,3) and interplanetary dust particles(4) is sometimes partially crystalline. The dust in young stars(5,6) also appears to be partially crystalline. These clouds to a planetary system, it must undergo some processing, Here we report observations of highly crystalline silicate dust in the disks surrounding binary red-giant stars. The dust was created in amorphous form in the outer atmospheres of the red giants, and therefore must be processed in the disks to become crystalline. The temperatures in these disks are too low for the grains to anneal; therefore, some low-temperature process must be responsible. As the physical properties of the disks around young stars and red giants are similar, our results suggest that low-temperature crystallization of silicate grains also can occur in protoplanetary systems.
引用
收藏
页码:563 / 565
页数:3
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