Radiative Diffusion in a Time-dependent Outflow:a Model for Fast Blue Optical Transients  

作　　者：Chun Chen Rong-Feng Shen 陈春;申荣锋(School of Physics and Astronomy,Sun Yat-Sen University,Zhuhai 519082,China;CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,Sun Yat-Sen University,Zhuhai 519082,China)

机构地区：[1]School of Physics and Astronomy,Sun Yat-Sen University,Zhuhai 519082,China [2]CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,Sun Yat-Sen University,Zhuhai 519082,China

出　　处：《Research in Astronomy and Astrophysics》2022年第3期168-177,共10页天文和天体物理学研究（英文版）

基　　金：supported by the China Manned Spaced Project(CMS-CSST-2021-B11);National Natural Science Foundation of China(12073091);Guangdong Basic and Applied Basic Research Foundation(2019A1515011119)。

摘　　要：Fast Blue Optical Transients(FBOTs)are luminous transients with fast evolving(typically t;<12 days)light curve and blue color(usually-0.2>g-r>-0.3)that cannot be explained by a supernova-like explosion.We propose a radiative diffusion in a time-dependent outflow model to interpret such special transients.In this model,we assume that a central engine ejects continuous outflow during a few days.We consider the ejection of the outflow to be time-dependent.The outflow is optically thick initially and photons are frozen in it.As the outflow expands over time,photons gradually escape,and our work is to model such an evolution.Numerical and analytical calculations are considered separately,and the results are consistent.We apply the model to three typical FBOTs:PS1-10 bjp,ZTF18 abukavn,and ATLAS 19 dqr.The modeling finds the total mass of the outflow(~1-5 M;),and the total time of the ejection(~a few days)for them,leading us to speculate that they may be the result of the collapse of massive stars.

关 键 词：(stars:)supergiants stars:winds OUTFLOWS stars:massive 

分 类 号：P152[天文地球—天文学]