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Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1

机译:来自pan-sTaRRs1的附近明星的宽,酷和Ultracool伴侣

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摘要

We present the discovery of 61 wide (>5 arcsecond) separation, low-mass(stellar and substellar) companions to stars in the solar neighborhoodidentified from Pan-STARRS\,1 (PS1) data and the spectral classification of 27previously known companions. Our companions represent a selective subsample ofpromising candidates and span a range in spectral type of K7-L9 with theaddition of one DA white dwarf. These were identified primarily from adedicated common proper motion search around nearby stars, along with a few asserendipitous discoveries from our Pan-STARRS1 brown dwarf search. Ourdiscoveries include 24 new L dwarf companions and one known L dwarf notpreviously identified as a companion. The primary stars around which wesearched for companions come from a list of bright stars with well-measuredparallaxes and large proper motions from the Hipparcos catalog (8583 stars,mostly A-K~dwarfs) and fainter stars from other proper motion catalogues (79170stars, mostly M~dwarfs). We examine the likelihood that our companions arechance alignments between unrelated stars and conclude that this is unlikelyfor the majority of the objects that we have followed-up spectroscopically. Wealso examine the entire population of ultracool (>M7) dwarf companions andconclude that while some are loosely bound, most are unlikely to be disruptedover the course of $\sim$10 Gyr. Our search increases the number of ultracool Mdwarf companions wider than 300 AU by 88% and increases the number of L dwarfcompanions in the same separation range by 96%. Finally, we resolve our new Ldwarf companion to HIP 6407 into a tight (0.13 arcsecond, 7.4 AU) L1+T3 binary,making the system a hierarchical triple. Our search for these key benchmarksagainst which brown dwarf and exoplanet atmosphere models are tested hasyielded the largest number of discoveries to date.
机译:我们提出了从Pan-STARRS \,1(PS1)数据和27个先前已知的伴星的光谱分类中识别出61个宽(> 5弧秒)间隔,低质量(星体和亚星体)伴星与太阳邻里恒星的发现。我们的同伴代表有希望的候选者的选择性子样本,并且在光谱类型为K7-L9的范围内,加上一个DA白矮星。这些主要是通过对附近恒星进行的常规共同适当运动搜索以及我们的Pan-STARRS1褐矮星搜索中的一些同食性发现确定的。我们的发现包括24个新的L矮伴,以及一个以前未被识别为伴的已知L矮。我们搜索伴星的主要恒星来自一系列明亮的恒星,这些恒星具有可测量的视差且来自Hipparcos目录中的大正常运动(8583星,主要是AK〜dwarfs)和来自其他正常运动目录的较暗的恒星(79170,主要是M〜矮人)。我们检查了我们的同伴在不相关的恒星之间进行惯性对准的可能性,并得出结论,对于我们用光谱学方法跟踪的大多数物体来说,这不太可能。我们还研究了所有超冷(> M7)矮伴星,并得出结论,尽管有些是松散绑定的,但大多数不会在$ \ sim $ 10 Gyr的过程中被破坏。我们的搜索将宽度超过300 AU的超冷Mdwarf伴侣的数量增加了88%,并将在相同分离范围内的L矮伴的数量增加了96%。最后,我们将HIP 6407的新Ldwarf伴侣解析为紧密的(0.13 arcsecond,7.4 AU)L1 + T3二进制文件,使系统成为分层的三元组。相对于测试褐矮星和系外行星大气模型的这些关键基准,我们的搜索已发现了迄今为止最多的发现。

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