New BVRI photometry results on Kuiper Belt Objects from the ESO VLT-猫眼课题宝

DOI：

10.1051/0004-6361:20078301

发表时间：

2008-12

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

P. Santos-Sanz;J. Ortiz;L. Barrera;H. B. I. D. A. D. Andaluc'ia-CSIC-H.-B.-I.-D.-A.-D.-Andaluc'ia-CSIC-1404104019;Granada;Spain.;Univ. Metropolitana de Ciencias de la Educaci'on-Univ.-Metropolitana-de-Ciencias-de-la-Educaci'on-1404104031;Dpto. de F'isica;S. Chile;Chile.;Max Planck Institute for Solar System Research;Katlenburg-Lindau;H Germany

上下文对海王星外天体（TNO）和半人马座天体的光度测量表明，经典天体、散射盘天体（SDO）和半人马座天体的某些轨道参数和表面颜色之间可能存在相关性。然而，需要更大的样本量，以证实或排除可能的相关性，并找到一些可能的新的。这些经典的TNOs，SDO和半人马座的形成和演化的相关性的影响是重要的，以了解可能的物理化学着色机制和它们对TNOs和半人马座的表面的影响，以及它们的进化历史。目标。我们的目标是获得一个足够大的光度数据集，以进行更重要的统计分析，重点是提高所观察到的对象的样本量，特别是对于经典的TNO和SDO。方法.我们使用VLT-FORS图像通过BVRI滤波器的32个柯伊伯带天体（KBO），并获得他们的颜色后，适当的减少和校准。我们研究了可能的相关性（Peixinho et al. 2004，Icarus，170，153; Doressoundiram et al. 2005，Icarus，174，90），通过非参数统计检验将这些新测量结果与ESO大型项目的VLT公布结果以及Meudon多色调查的最新公布结果合并。结果我们获得了一个包含116个天体（经典天体、SDO天体和半人马座天体）的大数据集，除了证实文献中的大多数相关性和结论外，还发现了一些可能的新的相关性，其中最有趣的是不同动力学群的颜色与轨道参数的相关性。我们发现，一些相关性的经典组，以及（动态）冷，热子群依赖于对象的大小。作为我们研究的副产品，我们能够确定新的候选光变曲线研究，并发现1055%的对象显示出高于0.15马格的变化。这是一个高于其他研究中发现的值。由于我们的样本比其他研究的样本包含更小的物体，这一结果可能表明较小的TNO比较大的TNO更长。

Context. Photometric surveys of transNeptunian objects (TNOs) and Centaurs have suggested possible correlations between some orbital parameters and surface colors of classical objects, scattered disk objects (SDOs), and Centaurs. However, larger sample sizes are needed in order to corroborate or rule out the possible correlations and find some possible new ones. The implications from these correlations for the formation and evolution of classical TNOs, SDOs, and Centaurs are important to understand possible physicochemical coloring mechanisms and their influence on the surfaces of the TNOs and Centaurs, as well as their evolutionary history. Aims. We aim to obtain a sufficiently large photometric dataset in order to carry out a more significant statistical analysis, with emphasis on improving the sample size of observed objects, in particular for classical TNOs and SDOs. Methods. We use VLT-FORS images through BVRI filters of 32 Kuiper Belt Objects (KBOs) and obtain their colors after proper reduction and calibration. We study the possible correlations (Peixinho et al. 2004, Icarus, 170, 153; Doressoundiram et al. 2005, Icarus, 174, 90) merging these new measurements with the VLT published results from the ESO large program and with the latest published results of the Meudon Multicolor Survey via non-parametric statistical tests. Results. We obtain a large dataset of 116 objects (classical, SDOs and Centaurs) and, in addition to confirming most of the correlations and conclusions reached in the literature, some possible new correlations are found. The most interesting ones are some correlations of color vs. orbital parameters for the different dynamical groups. We find that some correlations in the classical group, as well as the (dynamically) cold and hot subgroups depend on the size of the objects. As a by-product of our study, we were able to identify new candidates for light curve studies and found that ∼55% of the objects showed variability above 0.15 mag. This is a higher value than what is found in other studies. Since our sample contains smaller objects than samples from other studies, this result might be an indication that the smaller TNOs are more elongated than the larger ones.

New BVRI photometry results on Kuiper Belt Objects from the ESO VLT

文献摘要

被引文献

相似文献