Soft X-ray Irradiation of Silicates: Implications on Dust Evolution in Protoplanetary Disks

TL;DR

This study investigates how soft X-ray irradiation affects silicate grains, revealing amorphization that could influence dust evolution in protoplanetary disks, with implications for planetary formation processes.

Contribution

It provides experimental evidence of X-ray induced amorphization of silicates, a novel insight into dust processing in protoplanetary environments.

Findings

Soft X-ray irradiation causes amorphization of silicate material.

Experimental setup used synchrotron radiation to simulate space conditions.

Results suggest X-ray processing impacts dust evolution in disks.

Abstract

The processing of energetic photons on bare silicate grains was simulated experimentally on silicate films submitted to soft X-rays of energies up to 1.25 keV. The silicate material was prepared by means of a microwave assisted solgel technique. Its chemical composition reflects the Mg2SiO4 stoichiometry with residual impurities due to the synthesis method. The experiments were performed using the spherical grating monochromator beamline at the National Synchrotron Radiation Research Center in Taiwan. We found that soft X-ray irradiation induces structural changes that can be interpreted as an amorphization of the processed silicate material. The present results may have relevant implications in the evolution of silicate materials in X-ray irradiated protoplanetary disks.