Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-06-17
Nature 459:224-226,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
13 pages of PDF, including Supplementary Information
Scientific paper
10.1038/nature08004
Our Solar System originated in interstellar gas and dust; the latter is in the form of amorphous silicate particles and carbonaceous dust. The composition of cometary material shows that a significant fraction of the amorphous silicates was transformed into crystalline form during the early evolution of the protosolar nebula. How and when this transformation happened has been controversial, with the main options being heating by the young Sun or shock heating. Here we report mid-infrared features in the outburst spectrum of the young solar-like star EX Lupi that were not present in quiescence. We attribute them to crystalline forsterite; the crystals were produced via 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.
Ábrahám Peter
Boekel Roy van
Bouwman Jeroen
Dullemond Cornelis Petrus
Henning Th
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