1A. Ciaravella, 1C. Cecchi-Pestellini, 2Y.-J. Chen, 3G. M. Muñoz Caro, 2C.-H. Huang, 1A. Jiménez-Escobar, 4A. M. Venezia
Astrophysical Journal 828, 29 Link to Article []
1INAF—Osservatorio Astronomico di Palermo, Parlamento 1, I-90134 Palermo, Italy
2Department of Physics, National Central University, Jhongli City, Taoyuan County 32054, Taiwan
3Centro de Astrobiología (INTA-CSIC), Carretera de Ajalvir, km 4, Torrejón de Ardoz, E-28850 Madrid, Spain
4ISMN—CNR, Via Ugo La Malfa 153, I-90146 Palermo, Italy

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 sol–gel 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.


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