（136108）妊神星家族候选成员的特征：II。后续观测
Characterisation of candidate members of (136108) Haumea's family: II. Follow-up observations
摘要：
根据对穿海王星天体（TNOs）轨道要素的动力学分析，Ragozzine & Brown报告了在这个群体中发现的第一个碰撞家族的候选成员名单，与（136108）Haumea（a.k.a.）有关。2003 EL61）。我们的目标是区分妊神星碰撞家族的真正成员和闯入者。我们在它们的表面寻找水冰，这是已知家族成员的共同特征。已确认的家庭的属性被用来约束妊神星，它的卫星，它的家庭的形成机制。光学和近红外光度法用于识别水冰。我们特别使用欧洲南方天文台甚大望远镜Hawk-I仪器的CH 4滤光片作为短H波段（Hs），（J-Hs）颜色是1.6 μm处水冰吸收带的灵敏量度。继续我们以前的研究为首的雪草，我们报告的颜色为8个候选家庭成员，包括近红外颜色为5。我们确认一个天体是碰撞家族的真正成员（2003 UZ 117），并拒绝了其他5个。由于缺乏其余两个物体的红外数据，无法得出任何结论。因此，被拒绝的成员总数为17名。11名已获确认的成员只占36名候选人的三分之一。妊神星家族的起源可能与一次撞击事件有关。然而，解释妊神星本身及其家族所有特性的方案仍然难以捉摸。
英文摘要：
From a dynamical analysis of the orbital elements of transneptunian objects (TNOs), Ragozzine & Brown reported a list of candidate members of the first collisional family found among this population, associated with (136108) Haumea (a.k.a. 2003 EL61). We aim to distinguish the true members of the Haumea collisional family from interlopers. We search for water ice on their surfaces, which is a common characteristic of the known family members. The properties of the confirmed family are used to constrain the formation mechanism of Haumea, its satellites, and its family. Optical and near-infrared photometry is used to identify water ice. We use in particular the CH4 filter of the Hawk-I instrument at the European Southern Observatory Very Large Telescope as a short H-band (Hs), the (J-Hs) colour being a sensitive measure of the water ice absorption band at 1.6 μm. Continuing our previous study headed by Snodgrass, we report colours for 8 candidate family members, including near-infrared colours for 5. We confirm one object as a genuine member of the collisional family (2003 UZ117), and reject 5 others. The lack of infrared data for the two remaining objects prevent any conclusion from being drawn. The total number of rejected members is therefore 17. The 11 confirmed members represent only a third of the 36 candidates. The origin of Haumea's family is likely to be related to an impact event. However, a scenario explaining all the peculiarities of Haumea itself and its family remains elusive.
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