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首页> 外文期刊>The Astrophysical Journal. Supplement Series >OSSOS. XII. Variability Studies of 65 Trans-Neptunian Objects Using the Hyper Suprime-Cam
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OSSOS. XII. Variability Studies of 65 Trans-Neptunian Objects Using the Hyper Suprime-Cam

机译：ossos。 XII。 超级超级凸轮的65个跨境对象的变异性研究

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摘要

We present variability measurements and partial light curves of trans-Neptunian objects (TNOs) from a two-night pilot study using Hyper Suprime-Cam (HSC) on the Subaru Telescope (Maunakea, Hawaii, USA). Subaru's large aperture (8 m) and HSC's large field of view (1.77 deg(2)) allow us to obtain measurements of multiple objects with a range of magnitudes in each telescope pointing. We observed 65 objects with in, m(r) = 22.6-25.5 mag in just six pointings, allowing 20-24 visits of each pointing over the two nights. Our sample, all discovered in the recent Outer Solar System Origins Survey (OSSOS), spans absolute magnitudes of H-r = 6.2-10.8 mag and thus investigates smaller objects than previous light curve projects have typically studied. Our data supports the existence of a correlation between the light curve amplitude and absolute magnitude seen in other works but does not support a correlation between the amplitude and orbital inclination. Our sample includes a number of objects from different dynamical populations within the trans-Neptunian region, but we do not find any relationship between variability and the dynamical class. We were only able to estimate periods for 12 objects in the sample and found that a longer baseline of observations is required for a reliable period analysis. We find that 31 objects (just under half of our sample) have variability of Delta(mag) greater than 0.4 mag during all of the observations; in smaller 1.25 hr, 1.85 hr, and 2.45 hr windows, the median Delta(mag) is 0.13, 0.16, and 0.19 mag, respectively. The fact that variability on this scale is common for small TNOs has important implications for discovery surveys (such as OSSOS or the Large Synoptic Survey Telescope) and color measurements.
机译：我们在使用超级超级凸轮（HSC）上的两夜飞行员研究的变化测量和部分光曲线（HSC）在斯图拉乌望远镜（Maunakea，Hawaii，USA）上。 Subaru的大孔径（8米）和HSC的大视野（1.77°Deg（2））允许我们在每个望远镜指向中获得多个物体的测量值，指向各个望远镜。我们观察到65个对象，M（r）= 22.6-25.5 mag，只有六个指点，允许在两晚上的每个指向的20-24次访问。我们的样本，所有在最近的外太阳系统起源调查（OSSOS）中发现，跨越H-R = 6.2-10.8 mag的绝对大小，因此调查比以前的光线项目通常研究的较小物体。我们的数据支持存在在其他作品中看到的光曲线幅度和绝对幅度之间的相关性，但不支持幅度和轨道倾斜之间的相关性。我们的样本包括来自跨境区域内不同动态群体的许多物体，但我们没有在变异性和动态类之间找到任何关系。我们只能估算样品中12个对象的时期，并发现可靠的期间分析需要更长的观察基线。我们发现，在所有观察中，31个对象（在我们样本的一半）具有大于0.4 mag的Δ（Mag）的可变性;在较小的1.25小时，1.85小时和2.45小时窗口中，中位数（Mag）分别为0.13,0.16和0.19 mag。对于小型TNO而言，这种规模的变异性具有重要意义对发现调查（例如OSSOS或大型舞台调查望远镜）和颜色测量的重要意义。

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