Carbon to oxygen ratios in extrasolar planetesimals
Carbon to oxygen ratios in extrasolar planetesimals
复制标题
太阳系外小行星中的碳氧比
DOI：
10.1093/mnras/stw844
复制
发表时间：
2016
影响因子：
4.8
通讯作者：
D. Koester
中科院分区：
文献类型：
--
作者：
David J. Wilson;B. Gaensicke;J. Farihi;D. Koester
对密度范围很广的太阳系外小行星的观测意味着行星的组成和结构多种多样。目前，测量太阳系外行星系统整体组成的唯一技术是分析吸积在白色矮星上的行星碎片，类似于陨石丰度研究。我们目前的碳和氧的丰度测量的星子碎片在10个白色矮星观察与哈勃太空望远镜，沿着与C/O比的碎片在6个系统与以前报告的丰度。我们没有发现富碳微行星（C/O =-0.92）和富氧天体（C/O小于或等于地球）的证据。后一组可能比地球具有更高的水质量分数，增加了它们的相对氧丰度。
Observations of small extrasolar planets with a wide range of densities imply a variety of planetary compositions and structures. Currently, the only technique to measure the bulk composition of extrasolar planetary systems is the analysis of planetary debris accreting onto white dwarfs, analogous to abundance studies of meteorites. We present measurements of the carbon and oxygen abundances in the debris of planetesimals at ten white dwarfs observed with the Hubble Space Telescope, along with C/O ratios of debris in six systems with previously reported abundances. We find no evidence for carbon-rich planetesimals, with C/O ) = −0.92, and oxygen-rich objects with C/O less than or equal to that of the bulk Earth. The latter group may have a higher mass fraction of water than the Earth, increasing their relative oxygen abundance.
DOI：
10.1088/0004-637x/800/2/135
发表时间：
2014-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson
通讯作者：
C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson