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arXiv 1101.2102astro-ph.EP
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妊神星136108的高对比度观测。一个结晶水冰复合系统

High-contrast observations of 136108 Haumea. A crystalline water-ice multiple system

Christophe Dumas, Benoit Carry, Daniel Hestroffer, Frederic Merlin

摘要:

上下文太阳系的外海王星区域居住着大量不同的冰体,在轨道行为、大小、表面颜色和成分上表现出极大的多样性。人们还可以注意到动力学家族和二元系统的存在。在一些最大的海王星外行星的光谱中发现的一个令人惊讶的特征是结晶水冰的存在。这是大型TNO(136 108)Haumea(2003 EL 61)的情况。目标。我们试图限制妊神星及其卫星的水冰状态,并研究可能的能源来维持水冰的结晶形式。方法.在近红外的光谱成像观测是用安装在欧洲南方天文台甚大望远镜UT 4上的积分场光谱仪SINFONI进行的。分析了妊神星及其较大卫星Hi'iaka的光谱。相对天体测量的组成部分也进行,提供了一个检查的轨道解决方案和春分季节。结果我们描述了妊神星及其最大卫星Hi'iaka表面结晶水冰的物理特征,并分析了维持水结晶状态的可能加热源:系统组件中的潮汐耗散与辐射源。Hi'iaka的表面似乎被大颗粒的水冰所覆盖,几乎完全以晶体形式存在。在某些限制条件下,妊神星和海卫星之间的辐射加热和潮汐力都可以提供足够的能量来维持冰的结晶状态。根据智利帕拉纳尔欧洲南方天文台(60.A-9235)收集的观测数据

英文摘要:

Context. The trans-neptunian region of the Solar System is populated by a large variety of icy bodies showing great diversity in orbital behavior, size, surface color and composition. One can also note the presence of dynamical families and binary systems. One surprising feature detected in the spectra of some of the largest Trans-Neptunians is the presence of crystalline water-ice. This is the case for the large TNO (136 108) Haumea (2003 EL61). Aims. We seek to constrain the state of the water ice of Haumea and its satellites, and investigate possible energy sources to maintain the water ice in its crystalline form. Methods. Spectro-imaging observations in the near infrared have been performed with the integral field spectrograph SINFONI mounted on UT4 at the ESO Very Large Telescope. The spectra of both Haumea and its larger satellite Hi'iaka are analyzed. Relative astrometry of the components is also performed, providing a check of the orbital solutions and equinox seasons. Results. We describe the physical characteristics of the crystalline water-ice present on the surface of Haumea and its largest satellite Hi'iaka and analyze possible sources of heating to maintain water in crystalline state: tidal dissipation in the system components vs radiogenic source. The surface of Hi'iaka appears to be covered by large grains of water ice, almost entirely in its crystalline form. Under some restricted conditions, both radiogenic heating and tidal forces between Haumea and Hi'iaka could provide the energy sufficient to maintain the ice in its crystalline state. Based on observations collected at the European SouthernObservatory, Paranal, Chile - 60.A-9235

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