New Chondritic Bodies Identified in Eight Oxygen-bearing White Dwarfs

被引:16
|
作者
Doyle, Alexandra E. [1 ]
Klein, Beth L. [2 ]
Dufour, Patrick [3 ,4 ]
Melis, Carl [5 ]
Zuckerman, B. [2 ]
Xu, Siyi [6 ]
Weinberger, Alycia J. [7 ]
Trierweiler, Isabella L. [1 ,2 ]
Monson, Nathaniel N. [1 ]
Jura, Michael A. [2 ]
Young, Edward D. [1 ]
机构
[1] Univ Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[3] Univ Montreal, Inst Rech Exoplanetes iREx, Montreal, PQ H3C 3J7, Canada
[4] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada
[5] Univ Calif San Diego, Ctr Astrophys & Space Sci, San Diego, CA 92093 USA
[6] NSFs NOIR Lab, Gemini Observ, Hilo, HI 96720 USA
[7] Carnegie Inst Sci, Earth & Planets Lab, 5241 Broad Branch Rd NW, Washington, DC 20015 USA
来源
ASTROPHYSICAL JOURNAL | 2023年 / 950卷 / 02期
基金
美国国家科学基金会;
关键词
METAL ABUNDANCE PATTERNS; PLANETARY DEBRIS; SPECTROSCOPIC ANALYSIS; CHEMICAL-COMPOSITION; TRACE HYDROGEN; MINOR PLANET; ACCRETION; ATMOSPHERE; RICH; WATER;
D O I
10.3847/1538-4357/acbd44
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present observations and analyses of eight white dwarf stars (WDs) that have accreted rocky material from their surrounding planetary systems. The spectra of these helium-atmosphere WDs contain detectable optical lines of all four major rock-forming elements (O, Mg, Si, and Fe). This work increases the sample of oxygen-bearing WDs with parent body composition analyses by roughly 33%. To first order, the parent bodies that have been accreted by the eight WDs are similar to those of chondritic meteorites in relative elemental abundances and oxidation states. Seventy-five percent of the WDs in this study have observed oxygen excesses implying volatiles in the parent bodies with abundances similar to those of chondritic meteorites. Three WDs have oxidation states that imply more reduced material than found in CI chondrites, indicating the possible detection of Mercury-like parent bodies, but are less constrained. These results contribute to the recurring conclusion that extrasolar rocky bodies closely resemble those in our solar system, and do not, as a whole, yield unusual or unique compositions.
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页数:17
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