Abstract Details
| Name: MAHADEVAPPA Affiliation: GITAM University off campus Hyderabad Conference ID: ASI2018_1639 Title : Theoretical and observational study of mineralogy in debris disks Authors and Co-Authors : Ajay Chaudhari Govt. Vidarbha Institute of Science and Humanities VMV Road Amravati -444604 Maharashtra (India) Abstract Type : Poster Abstract Category : Stars,ISM and the Galaxy Abstract : Debris disks are dusty disks around main sequence stars that are distinguished from proto-planetary disks by their small gas: dust ratios. The present study reports optimized structures of (Mg2SiO4, fused quartz and annealed silica) at different temperatures using the molecular dynamics technique (BOMD or ADMP). The effect of structural change in molecule on infrared and electronic absorption spectra at different temperatures reported. The exact mode identification of structures at different temperatures is possible with vibrational spectroscopy. The rotational, centrifugal distortional constants and electronic absorption spectra of these structures are also reported. All these theoretical calculations performed using Gaussian 09 and Crystal 14 software. Mineralogy of debris disks is important for understanding of their physical properties. This study will compare theoretical infrared spectra at different temperatures with the observational spectra. The temperature and composition dependence of the 69 µm band is thought to be a good tool to study the conditions, but we do not have a firm theoretical basis of the variation, which is needed for correct interpretation of observations. It is clear that significant progress in our understanding of the astronomical 69 µm spectra can only be made by a joint effort of observational and theoretical tools. |