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arXiv 0910.0450astro-ph.EP
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海王星外天体和半人马座天体的新ESO大型计划的可见光谱学:最终结果

Visible spectroscopy of the new ESO Large Program on trans-Neptunian objects and Centaurs: final results

S. Fornasier, M. A. Barucci, C. de Bergh, A. Alvarez-Candal, F. DeMeo, F. Merlin, D. Perna, A. Guilbert, A. Delsanti, E. Dotto, A. Doressoundiram

摘要:

2006年10月在塞罗帕拉纳尔欧洲南方天文台开始的第二个大型方案(LP)最近已经结束,该方案的目的是对TNO和半人马座进行物理研究,以获得高质量的数据。在本文中,我们介绍了在LP的最后两个学期期间在可见光范围内获得的这些原始天体的光谱。我们调查的光谱行为的TNO和半人马座观察到的,我们分析的光谱斜率分布的完整的数据集来自这个LP和文献。我们计算了每个观测对象的光谱斜率,并寻找可能的弱吸收特征。对73个TNO和半人马座的总样本进行了统计分析,以寻找动力学类别,轨道参数和光谱梯度之间可能的相关性。我们获得了28个天体的新光谱,其中15个是首次观测到的。所有新提出的光谱都是没有特征的,包括2003年的AZ 84,据报道,它有一个微弱而宽的吸收带,可能是由于其表面的水合硅酸盐。这些数据证实了各种各样的光谱行为,中性-灰色到非常红色的梯度。从这个LP和文献中的73个半人马座和TNO的总样本的光谱斜率的分析表明,有一个非常红色的对象在经典的人口缺乏。我们提出的光谱斜率分布与轨道参数的统计分析的结果。特别是,我们确认了一个强大的光谱斜率和轨道倾角之间的关系的经典人口。对于共振TNO,光谱斜率和轨道偏心率之间也存在很强的相关性,随着偏心率的增加,物体的光谱斜率值也会增加。

英文摘要:

A second large programme (LP) for the physical studies of TNOs and Centaurs, started at ESO Cerro Paranal on October 2006 to obtain high-quality data, has recently been concluded. In this paper we present the spectra of these pristine bodies obtained in the visible range during the last two semesters of the LP. We investigate the spectral behaviour of the TNOs and Centaurs observed, and we analyse the spectral slopes distribution of the full data set coming from this LP and from the literature. We computed the spectral slope for each observed object, and searched for possible weak absorption features. A statistical analysis was performed on a total sample of 73 TNOs and Centaurs to look for possible correlations between dynamical classes, orbital parameters, and spectral gradient. We obtained new spectra for 28 bodies, 15 of which were observed for the first time. All the new presented spectra are featureless, including 2003 AZ84, for which a faint and broad absorption band possibly attributed to hydrated silicates on its surface has been reported. The data confirm a wide variety of spectral behaviours, with neutral--grey to very red gradients. An analysis of the spectral slopes available from this LP and in the literature for a total sample of 73 Centaurs and TNOs shows that there is a lack of very red objects in the classical population. We present the results of the statistical analysis of the spectral slope distribution versus orbital parameters. In particular, we confirm a strong anticorrelation between spectral slope and orbital inclination for the classical population. A strong correlation is also found between the spectral slope and orbital eccentricity for resonant TNOs, with objects having higher spectral slope values with increasing eccentricity.

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