Episodic formation of cometary material in the outburst of a young Sun-like star

被引：120
|
作者：
Abraham, P. [1 ]
Juhasz, A. [2 ]
Dullemond, C. P. [2 ]
Kospal, A. [3 ]
Van Boekel, R. [2 ]
Bouwman, J. [2 ]
Henning, Th. [2 ]
Moor, A. [1 ]
Mosoni, L. [1 ,2 ]
Sicilia-Aguilar, A. [2 ]
Sipos, N. [1 ]
机构：
[1] Hungarian Acad Sci, Konkoly Observ Budapest, H-1525 Budapest, Hungary
[2] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[3] Leiden Univ, Leiden Observ, NL-2333 CA Leiden, Netherlands
来源：
NATURE | 2009年 / 459卷 / 7244期
关键词：
CRYSTALLINE SILICATES; DUST; EVOLUTION; SPECTRA; GRAINS; DISKS;
D O I：
10.1038/nature08004
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：
The Solar System originated in a cloud of interstellar gas and dust. The dust is in the form of amorphous silicate particles(1,2) and carbonaceous dust. The composition of cometary material, however, shows that a significant fraction of the amorphous silicate dust was transformed into crystalline form during the early evolution of the protosolar nebula(3). How and when this transformation happened has been a question of debate, with the main options being heating by the young Sun(4,5) and shock heating(6). Here we report mid-infrared features in the outburst spectrum of the young Sun-like star EX Lupi that were not present in quiescence. We attribute them to crystalline forsterite. We conclude that the crystals were produced through thermal annealing in the surface layer of the inner disk by heat from the outburst, a process that has hitherto not been considered. The observed lack of cold crystals excludes shock heating at larger radii.
引用
收藏
页码：224 / 226
页数：3
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