An Unbiased Mineral Compositional Analysis Technique for Circumstellar Disks

Y. Kipreos, I. Song
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Abstract

A circumstellar disk that surrounds a star is composed of gas, dust, and rocky objects that are in orbit around it. Around infant stars, this disk can act as a source of material that can be used to form planetesimals, which can then accrete more material and form into planets. Studying the mineral composition of these disks can provide insight into the processes that created our solar system. The purpose of this paper is to analyze the mineral composition of these disks by using a newly created python package, Min-CaLM. This package determines the relative mineral abundance within a disk by using a linear regression technique called non-negative least square minimization. The circumstellar disks that are capable of undergoing compositional analysis must have a spectrum with both a detectable mid-infrared excess and prominent silicate features. From our sample, there are only eight debris disks that qualify to be candidates for the Min-CaLM program. The mineral compositions calculated by Min-CaLM are then compared to the Tholen asteroid classification scheme. HD 23514, HD 105234, HD 15407A, BD+20 307, HD 69830, and HD 172555 are found to have a compositions similar to that expected for C-type asteroids, TYC 9410-532-1 resembles the composition of S-type asteroids, and HD 100546 resembles D-type asteroids. Min-CaLM also calculates the mineral compositions of the comets Tempel 1 and Hale-Bopp, and they are used as a comparison between the material in our early solar system and the debris disk compositions. KEYWORDS: Debris disk; Mineral; Composition; Analysis; Asteroid; Circumstellar; Spectroscopy; Python
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环绕星盘矿物成分的无偏分析技术
围绕恒星的星周盘由围绕恒星运行的气体、尘埃和岩石物体组成。在幼年恒星周围,这个盘可以作为物质来源,用于形成星子,然后星子可以吸积更多的物质并形成行星。研究这些圆盘的矿物成分可以深入了解太阳系的形成过程。本文的目的是通过使用新创建的python包Min CaLM来分析这些磁盘的矿物成分。该软件包通过使用一种称为非负最小二乘最小化的线性回归技术来确定圆盘内的相对矿物丰度。能够进行成分分析的星周盘必须具有可检测的中红外过量和突出硅酸盐特征的光谱。从我们的样本中,只有八个碎片盘符合Min CaLM计划的候选条件。然后将Min CaLM计算的矿物成分与Tholen小行星分类方案进行比较。HD 23514、HD 105234、HD 15407A、BD+20 307、HD 69830和HD 172555被发现具有与C型小行星预期的成分相似的成分,TYC 9410-532-1与S型小行星的成分相似,HD 100546与D型小行星相似。Min CaLM还计算了Tempel 1彗星和Hale Bopp彗星的矿物成分,它们被用来比较我们早期太阳系中的物质和碎片盘的成分。关键词:碎屑盘;矿物作文分析小行星环星;光谱学;蟒蛇
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