SOFT X-RAY IRRADIATION OF SILICATES: IMPLICATIONS FOR DUST EVOLUTION IN PROTOPLANETARY DISKS

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 [http://dx.doi.org/10.3847/0004-637X/828/1/29]
1INAF—Osservatorio Astronomico di Palermo, P.za 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.

Discuss

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s