哈勃空间望远镜WFC3观测对中晚T矮星双星性质的约束
Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations
摘要：
我们使用HST/WFC 3观测的26个附近（$\le$ 20 pc）中晚期T矮星的样本，以寻找较冷的同伴和测量棕矮星的多重统计。使用双PSF拟合算法搜索紧密分离的同伴。我们还比较了我们的检测限的基础上模拟其他先前的T5+褐矮星二进制程序。没有发现新的宽伴星或紧伴星，这与已知的T5+双星系统的数量和WFC 3的分辨率极限是一致的。我们使用我们的结果添加新的约束的T-型棕矮星的二进制分数。模拟选择效应，并采用先前推导的分离和质量比分布，我们发现一个上限总二进制分数<16%和<25%假设幂律和平坦的质量比分布，这与以前的结果是一致的。我们还描述了少数目标周围的L/T过渡。
英文摘要：
We used HST/WFC3 observations of a sample of 26 nearby ($\le$20 pc) mid to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs. Tightly-separated companions were searched for using a double-PSF fitting algorithm. We also compared our detection limits based on simulations to other prior T5+ brown dwarf binary programs. No new wide or tight companions were identified, which is consistent with the number of known T5+ binary systems and the resolution limits of WFC3. We use our results to add new constraints to the binary fraction of T-type brown dwarfs. Modeling selection effects and adopting previously derived separation and mass ratio distributions, we find an upper limit total binary fraction of <16% and <25% assuming power law and flat mass ratio distributions respectively, which are consistent with previous results. We also characterize a handful of targets around the L/T transition.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
