木星特洛伊的可见光谱和光度测量：动力学族的最终结果
Visible spectroscopic and photometric survey of Jupiter Trojans: final results on dynamical families
摘要：
我们提出了一个可见光光谱和光度调查的木星特洛伊属于不同的动态家庭进行的ESO-NTT望远镜的结果。我们获得了47个物体的数据，其中23个属于L5群，24个属于L4群。这些数据加上Fornasier等人（2004年a）和Dotto等人（2006年）已经发表的数据，构成了80个天体的可见光谱样本。这项调查使我们能够调查六个家庭（Aneas，Alzheises，Misenus，Phereclos，Sarpedon，Panthoos）在L5云和四个L4家庭（Eurybates，Menelaus，1986年WD和1986年TS 6）。我们测量的样本主要是D-型小行星，除了L4群中的Eurybates家族，那里主要是C-和P-型小行星。我们得到的所有光谱都是无特征的，除了一些Eurybates成员，在5200 A的短时间内检测到反射率的下降。在主带C型小行星中也发现了类似的特征，通常归因于氧化铁的价间电荷转移跃迁。我们的样本包括微弱和较小的特洛伊木马相比，文献的数据，并允许我们调查估计直径小于40- 50公里的对象的属性。光谱斜率和颜色与估计直径的分析表明，蓝色和红色物体具有不可区分的大小分布。我们进行统计调查的特洛伊的光谱特性分布作为其轨道和物理参数的函数，并与其他类的小天体在太阳系外。低倾角的特洛伊人比高倾角的特洛伊人看起来更蓝，但这种效果是由欧里贝茨家族强烈驱动的。
英文摘要：
We present the results of a visible spectroscopic and photometric survey of Jupiter Trojans belonging to different dynamical families carried out at the ESO-NTT telescope. We obtained data on 47 objects, 23 belonging to the L5 swarm and 24 to the L4 one. These data together with those already published by Fornasier et al. (2004a) and Dotto et al. (2006), constitute a total sample of visible spectra for 80 objects. The survey allows us to investigate six families (Aneas, Anchises, Misenus, Phereclos, Sarpedon, Panthoos) in the L5 cloud and four L4 families (Eurybates, Menelaus, 1986 WD and 1986 TS6). The sample that we measured is dominated by D--type asteroids, with the exception of the Eurybates family in the L4 swarm, where there is a dominance of C- and P-type asteroids. All the spectra that we obtained are featureless with the exception of some Eurybates members, where a drop--off of the reflectance is detected shortward of 5200 A. Similar features are seen in main belt C-type asteroids and commonly attributed to the intervalence charge transfer transition in oxidized iron. Our sample comprises fainter and smaller Trojans as compared to the literature's data and allows us to investigate the properties of objects with estimated diameter smaller than 40--50 km. The analysis of the spectral slopes and colors versus the estimated diameters shows that the blue and red objects have indistinguishable size distribution. We perform a statistical investigation of the Trojans's spectra property distributions as a function of their orbital and physical parameters, and in comparison with other classes of minor bodies in the outer Solar System. Trojans at lower inclination appear significantly bluer than those at higher inclination, but this effect is strongly driven by the Eurybates family.
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