¹Alexandra E. Doyle et al. (>10)
The Astrophysical Journal 950, 93 Open Access Link to Article [DOI 10.3847/1538-4357/acbd44]
¹Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095, USA

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.

^1,2Wang, Hongpeng,^1,3Xin, Yingjian,^1,3,4Fang, Peipei,^3,4Wang, Yian,^1,3Duan, Mingkang,⁵Wu, Wenming,⁶Yang, Ruidong,²Liu, Sicong ¹Zhang, Liang,^1,4Wan, Xiong
Chemosensors 11, 567 Open Access Link to Article [DOI 10.3390/chemosensors11110567]
¹Key Laboratory of Space Active Opto-Electronics Technology of the Chinese, Academy of Sciences, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China
²College of Surveying and Geo-Informatics, Tongji University, Shanghai, 200092, China
³University of the Chinese Academy of Sciences, Beijing, 100049, China
⁴Key Laboratory of Systems Health Science of Zhejiang Province, School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China
⁵Geological Brigade 105, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiyang, 550018, China
⁶College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China

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