论文标题
y矮人的人口与HST：解锁我们最酷的邻居的秘密 - I.概述和第一个星形结果
The Y dwarf population with HST: unlocking the secrets of our coolest neighbours -- I. Overview & First astrometric results
论文作者
论文摘要
在本文中，我们介绍了我们的项目，该项目旨在使用哈勃太空望远镜确定Y Brown Dwarf人群的准确距离和适当的动作。我们使用Y0PEC DWARF明智的J163940.83 $ -684738.6的单个新时代进行了新的观察，我们使用了第一个结果来验证该程序。这些新数据使我们能够完善其适当的运动，并将其视差的准确性提高了三倍，而现在被限制在$ \ varpi = 211.11 \ pm 0.56 $ MAS。这种新得出的绝对视差对应于$ 4.737 \ pm 0.013 $ pc的距离，这是微弱的超级型矮人的精致和前所未有的精度。
In this paper we present our project that aims at determining accurate distances and proper motions for the Y brown dwarf population using the Hubble Space Telescope. We validate the program with our first results, using a single new epoch of observations of the Y0pec dwarf WISE J163940.83$-$684738.6. These new data allowed us to refine its proper motion and improve the accuracy of its parallax by a factor of three compared to previous determinations, now constrained to $\varpi = 211.11 \pm 0.56$ mas. This newly derived absolute parallax corresponds to a distance of $4.737 \pm 0.013$ pc, an exquisite and unprecedented precision for faint ultracool Y dwarfs.
