Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data

Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
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使用暗能量勘测 DR1 和盖亚 DR2 数据增加宽二元系统和多系统中超冷矮星的普查

DOI:
10.1093/mnras/staa3118
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发表时间:
2020
影响因子:
4.8
通讯作者:
Dal Ponte M
Dal Ponte M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Dal Ponte M

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我们发现了255个双星和6个多系统候选者,它们具有宽(> 5角秒)的分离,由恒星的超冷矮星(UCD)伴星组成,加上9个双超冷矮星系统。这些系统是根据共同的距离标准选择的。大约90%的样本有自行可用,73%的系统也满足共同的自行标准。超冷候选者的样本来自暗能量调查(DES),候选恒星的原色来自盖亚DR2和DES数据。我们计算机会对齐概率,以评估每对的物理性质。我们发现,174个候选人对盖亚DR2小学和81对DES星星作为小学有机会对齐概率。只确定了由两个UCD组成的九个候选系统。候选多系统样本由五个三重系统和一个四重系统组成。在双星和多次波中发现的大多数UCD是早期L型的,而L型光谱类型上的典型宽双星分数是。我们的候选宽二进制与UCD作为secondaries的样本构成了一个大幅度增加,在已知的数量这样的系统,这是非常有用的约束UCD的形成和演化。
We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems were selected based on common distance criteria. About 90 per cent of the total sample has proper motions available and 73 per cent of the systems also satisfy a common proper motion criterion. The sample of ultracool candidates was taken from the Dark Energy Survey (DES) and the candidate stellar primaries are from Gaia DR2 and DES data. We compute chance alignment probabilities in order to assess the physical nature of each pair. We find that 174 candidate pairs with Gaia DR2 primaries and 81 pairs with a DES star as a primary have chance alignment probabilities. Only nine candidate systems composed of two UCDs were identified. The sample of candidate multiple systems is made up of five triple systems and one quadruple system. The majority of the UCDs found in binaries and multiples are of early L type and the typical wide binary fraction over the L spectral types is. Our sample of candidate wide binaries with UCDs as secondaries constitutes a substantial increase over the known number of such systems, which are very useful to constrain the formation and evolution of UCDs.
来自两微米全天巡天的三个宽间隔 L 型矮星伴星:Gliese 337C、Gliese 618.1B 和 HD 89744B
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