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>THE MOVING GROUP TARGETS OF THE SEEDS HIGH-CONTRAST IMAGING SURVEY OF EXOPLANETS AND DISKS: RESULTS AND OBSERVATIONS FROM THE FIRST THREE YEARS
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THE MOVING GROUP TARGETS OF THE SEEDS HIGH-CONTRAST IMAGING SURVEY OF EXOPLANETS AND DISKS: RESULTS AND OBSERVATIONS FROM THE FIRST THREE YEARS
We present results from the first three years of observations of moving group (MG) targets in the Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) high-contrast imaging survey of exoplanets and disks using the Subaru telescope. We achieve typical contrasts of ~105 at 1'' and ~106 beyond 2'' around 63 proposed members of nearby kinematic MGs. We review each of the kinematic associations to which our targets belong, concluding that five, β Pictoris (~20?Myr), AB Doradus (~100?Myr), Columba (~30?Myr), Tucana-Horogium (~30?Myr), and TW Hydrae (~10?Myr), are sufficiently well-defined to constrain the ages of individual targets. Somewhat less than half of our targets are high-probability members of one of these MGs. For all of our targets, we combine proposed MG membership with other age indicators where available, including Ca II HK emission, X-ray activity, and rotation period, to produce a posterior probability distribution of age. SEEDS observations discovered a substellar companion to one of our targets, κ And, a late B star. We do not detect any other substellar companions, but do find seven new close binary systems, of which one still needs to be confirmed. A detailed analysis of the statistics of this sample, and of the companion mass constraints given our age probability distributions and exoplanet cooling models, will be presented in a forthcoming paper.
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机译:我们使用斯巴鲁望远镜对系外行星和盘的战略探索(SEEDS)高对比度成像调查系外行星和盘的运动组(MG)目标的前三年观测结果。我们在附近的运动MG的63个提议成员周围获得了1''处〜105的对比度和2''处〜106的典型对比度。我们回顾了目标所属的每个运动学关联,其中包括五个,分别是:Pictoris(〜20?Myr),AB Doradus(〜100?Myr),Columba(〜30?Myr),Tucana-Horogium(〜30? Myr)和TW Hydrae(〜10?Myr),定义明确,足以约束单个目标的年龄。这些目标之一的高概率成员大约不到我们目标的一半。对于我们的所有目标,我们将提议的MG成员资格与其他可用的年龄指标(包括Ca II HK发射,X射线活动和旋转周期)相结合,以产生年龄的后验概率分布。 SEEDS的观测发现了我们目标之一κAnd的一颗恒星伴星,后者是一颗已故的B星。我们没有检测到任何其他的星际伴星,但确实找到了七个新的近距离二元系统,其中一个仍需要确认。将在即将发表的论文中详细分析该样本的统计数据,并根据我们的年龄概率分布和系外行星降温模型对伴随的质量约束进行分析。
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