POSSIBLE SIGNS OF WATER AND DIFFERENTIATION IN A ROCKY EXOPLANETARY BODY
POSSIBLE SIGNS OF WATER AND DIFFERENTIATION IN A ROCKY EXOPLANETARY BODY
复制标题
岩石系外行星体中可能存在水和分化的迹象
DOI：
10.1088/2041-8205/728/1/l8
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
D. Koester
中科院分区：
文献类型：
--
作者：
J. Farihi;C. Brinkworth;B. Gänsicke;T. Marsh;J. Girven;J. Girven;D. Hoard;B. Klein;D. Koester
斯皮策望远镜的观测揭示了一个被潮汐摧毁的岩石和可能是冰的行星体围绕白色矮星GD 61运行时产生的温暖碎片的存在。被金属污染的恒星光球层的紫外线和光学光谱显示出氢、氧、镁、硅、铁和钙的痕迹。这些元素的标称比率表明，相对于预期的成岩金属氧化物，氧过量，因此水可能与类地碎屑一起堆积。铁相对于镁和硅来说是缺乏的，这表明这种物质可能起源于一个分化的母体的外层，就像月球被广泛接受的那样。
Spitzer observations reveal the presence of warm debris from a tidally destroyed rocky and possibly icy planetary body orbiting the white dwarf GD 61. Ultraviolet and optical spectroscopy of the metal-contaminated stellar photosphere reveal traces of hydrogen, oxygen, magnesium, silicon, iron, and calcium. The nominal ratios of these elements indicate an excess of oxygen relative to that expected from rock-forming metal oxides, and thus it is possible that water was accreted together with the terrestrial-like debris. Iron is found to be deficient relative to magnesium and silicon, suggesting the material may have originated as the outer layers of a differentiated parent body, as is widely accepted for the Moon.