矮行星厄里斯的旋转相位相关 J - H 颜色

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
R. Szakáts, Csaba Kiss
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引用次数: 0

摘要

最大的天体——或矮行星——在柯伊伯带天体中构成了不同的类别,其特征是明亮的表面和挥发性成分,与较小的海王星外天体明显不同。这些成分的差异也反映在可见光和近红外颜色上,并且表面上的变化会导致宽带颜色随旋转相位而变化。在这里,我们介绍了用红外望远镜设施的导盲犬相机获得的矮行星(136199)Eris的近红外J和h波段观测结果。这些测量结果表明——正如之前的J−H测量所怀疑的那样——阋神星的J−H颜色确实随着旋转相位的变化而变化。这表明表面在化学成分和/或其他材料性质上存在显著的不均匀性,尽管表面具有相当均匀的高反照率,其特征是可见范围光曲线的振幅非常低。虽然主要CH4的晶粒尺寸的变化通常可能导致J−H颜色的显著变化,但在目前观察到的系统几何结构中,它只能部分解释观察到的J−H变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rotational Phase Dependent J − H Colour of the Dwarf Planet Eris
The largest bodies—or dwarf planets—constitute a different class among Kuiper Belt objects and are characterized by bright surfaces and volatile compositions remarkably different from that of smaller trans-Neptunian objects. These compositional differences are also reflected in the visible and near-infrared colors, and variegations across the surface can cause broadband colors to vary with rotational phase. Here we present near-infrared J and H-band observations of the dwarf planet (136199) Eris obtained with the GuideDog camera of the Infrared Telescope Facility. These measurements show that—as suspected from previous J − H measurements—the J − H color of Eris indeed varies with rotational phase. This suggests notable surface heterogenity in chemical composition and/or other material properties despite the otherwise quite homogeneous, high albedo surface, characterized by a very low amplitude visible range light curve. While variations in the grain size of the dominant CH4 may in general be responsible for notable changes in the J − H color, in the current observing geometry of the system it can only partially explain the observed J − H variation.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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