探测到气体的碎片盘统计研究  

Statistical Study of Debris Disks with Gas Detected

作　　者：曹鹏程 刘琼 廖能惠 CAO Peng-cheng;LIU Qiong;LIAO Neng-hui(School of Physics,Guizhou University,Guiyang 550000)

机构地区：[1]贵州大学物理学院,贵阳550000

出　　处：《天文学报》2022年第6期108-118,共11页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(U1631109、11703093、U2031120);贵州大学一流学科建设(物理学)以及校立特设岗位基金项目(201911A)资助。

摘　　要：碎片盘通常被描述为贫气盘,其气尘比显著低于原行星盘,因此很少在碎片盘中探测到气体.得益于各种灵敏的望远镜,探测到气体的碎片盘的数量正在不断增加,寻找更多的含有气体的碎片盘成为碎片盘研究的重点课题.然而大范围的搜寻非常耗时且低效,因而为了更快更好地遴选探测的目标,需要根据这类源的特性择选更小范围样本.通过统计探测到气体的碎片盘及其宿主恒星的参数总结出这些源的总体特性.为此搜集了已经发表的探测到气体的碎片盘的文献,总计找到37个源,包括探测到CO等冷气体的12个源、CaⅡ等热气体的14个源以及冷热气体共存的11个源.通过统计其宿主恒星的光谱类型、年龄、离地球距离和碎片盘的相对光度、气体质量、尘埃质量等信息,得出了主要结论:宿主恒星多为B型和A型恒星,年龄大部分都小于50 Myr,相对光度分布相比于已知碎片盘更为集中,在10^(-5)-10^(-2)区间范围.Debris disks have been described as gas-poor disks with gas-to-dust ratio is significantly lower than that of the protoplanetary disks so that gas is rarely detected in debris disks.Thanks to various sensitive telescopes,the number of debris disks with gas detection is increasing,so finding more debris disks with gas has become a key topic in debris disk research.However,large-scale search is very time-consuming and inefficient.Therefore,in order to select detection targets faster and better,it is necessary to select smaller-scale samples according to the characteristics of such sources.This paper aims to summarize the overall characteristics of these sources by analyzing the parameters of debris disks and their host stars.For this purpose,this paper collected published literature of debris disks with gas detected and found a total of 37 sources,including 12 sources of cold gases such as CO,14 sources of hot gases such as Call and 11 sources of coexistence of cold and hot gases.Through statistics of the spectral types,ages and distances of the host stars,as well as the fractional luminosities,gas mass and dust mass of the disks,this paper draws the conclusion:the host stars are mostly B-type and A-type stars.The stellar ages are mostly less than 50 Myr.The distribution of fractional luminosities is more concentrated than the known debris disks,which is in the range of 10^(−5)–10^(−2).

关 键 词：恒星:形成 原行星盘 方法:统计 

分 类 号：P152[天文地球—天文学]