Optical Properties of C-rich(12C,SiC and FeC)Dust Layered Structure of Massive Stars  

作　　者：Rui-Qing Wu Meng-Qiu Long Xiao-Jiao Zhang Yun-Peng Wang Meng-Li Yao Ming-Ming Li Chun-Hua Zhu Guo-Liang Lü Zhao-Jun Wang Ju-Jia Zhang Zhao Wang Wu-Jin Chen 

机构地区：[1]School of Physics and Electronics,Central South University,Changsha 410083,China [2]School of Physical Science and Technology,Xinjiang University,Urumqi 830046,China [3]Yunnan Observatories(YNAO),Chinese Academy of Sciences,Kunming 650216,China [4]School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China [5]School of Medicine,Xinjiang Medical University,Urumqi 830011,China

出　　处：《Research in Astronomy and Astrophysics》2022年第3期133-142,共10页天文和天体物理学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China。

摘　　要：The composition and structure of interstellar dust are important and complex for the study of the evolution of stars and the interstellar medium(ISM).However,there is a lack of corresponding experimental data and model theories.By theoretical calculations based on ab-initio method,we have predicted and geometry optimized the structures of Carbon-rich(C-rich)dusts,carbon(^(12)C),iron carbide(Fe C),silicon carbide(Si C),even silicon(^(28)Si),iron(^(56)Fe),and investigated the optical absorption coefficients and emission coefficients of these materials in 0D(zero-dimensional),1D,and 2D nanostructures.Comparing the nebular spectra of the supernovae(SN)with the coefficient of dust,we find that the optical absorption coefficient of the 2D^(12)C,^(28)Si,^(56)Fe,Si C and Fe C structure corresponds to the absorption peak displayed in the infrared band(5–8)μm of the spectrum at 7554 days after the SN1987A explosion.It also corresponds to the spectrum of 535 days after the explosion of SN2018bsz,when the wavelength was in the range of(0.2–0.8)and(3–10)μm.Nevertheless,2D Si C and Fe C correspond to the spectrum of 844 days after the explosion of SN2010jl,when the wavelength is within(0.08–10)μm.Therefore,Fe C and Si C may be the second type of dust in SN1987A corresponding to infrared band(5–8)μm of dust and may be in the ejecta of SN2010jl and SN2018bsz.The nano-scale C-rich dust size is~0.1 nm in SN2018bsz,which is 3 orders of magnitude lower than the value of 0.1μm.In addition,due to the ionization reaction in the supernova remnant(SNR),we also calculated the Infrared Radiation(IR)spectrum of dust cations.We find that the cation of the 2D layered(Si C)^(2+)has a higher IR spectrum than those of the cation(Si C)^(1+)and neutral(Si C)^(0+).

关 键 词：stars:carbon (ISM:)dust EXTINCTION ISM:abundances 

分 类 号：P152[天文地球—天文学]