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Communication Dans Un Congrès Année : 2022

Laboratory astrophysics with shock tubes

Ludovic Biennier

Résumé

Astrophysical shocks participate to the chemical evolution of the interstellar medium. These violent events strongly alter dust grains and lead to the release of new molecular species in the gas phase. Only a few studies on the shock processing of cosmic analogues have been conducted so far. We explored in the laboratory the destruction of dust components using a shock tube associated to optical diagnostics. Shock tubes are commonly employed for fast thermal processing of gases and materials. Our efforts have been first devoted to probe in situ the shock-induced decomposition of fullerene C60 at high temperatures (~5000 K) by optical emission spectroscopy. The spectra point to the massive production of C2 units. Molecular dynamics simulations have been conducted to support the experimental findings. Other cosmic dust analogues such as silicon carbide (SiC) particles have also been exposed and the solid carbonaceous residues examined by a variety of ex situ analytical techniques (X-ray diffraction, transmission electron microscopy). Shock processing of SiC dust leads to the formation of a wide variety of carbon allotropes. These experiments provide some insights into the lifecycle of carbon in space. Our work confirms the potential of shock tubes for laboratory astrophysics.
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Dates et versions

hal-04295789 , version 1 (20-11-2023)

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  • HAL Id : hal-04295789 , version 1

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Ludovic Biennier. Laboratory astrophysics with shock tubes. Spectroscopy and Dynamics of Molecules and Clusters SDMC 2022, Nov 2022, Malpe, India. ⟨hal-04295789⟩
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