DANCING IN THE DARK: NEW BROWN DWARF BINARIES FROM KERNEL PHASE INTERFEROMETRY
DANCING IN THE DARK: NEW BROWN DWARF BINARIES FROM KERNEL PHASE INTERFEROMETRY
复制标题
在黑暗中跳舞：来自核相位干涉测量的新棕矮星双星
DOI：
10.1088/0004-637x/767/2/110
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
P. Tuthill
中科院分区：
文献类型：
--
作者：
B. Pope;F. Martinache;P. Tuthill
本文重温了以前用哈勃太空望远镜的NICMOS NIC1仪器观察到的太阳附近的超冷矮星样本。我们已经应用了一种新的高角分辨率数据分析技术的基础上提取和拟合的核相位档案数据。这被发现提供了一个显着的改进，较早的分析方法，允许搜索同伴下降到预测分离的NIC1 Au快照图像。我们揭示了五个新的近距离双星候选人，并提出了修订后的天体测量先前已知的双星，所有这些都是恢复的技术。新的候选双星有足够近的分离，以确定在短期观测活动的动力学质量。我们还提出了四个边缘检测的对象，这可能是非常接近的二进制或高对比度的同伴。包括只有19 pc内的置信检测，我们报告的二进制分数至少。这里报道的结果提供了新的见解附近的ultracool二进制的人口，同时也提供了一个精辟的案例研究的好处所赋予的内核相位的方法在恢复同伴在几个分辨率元素的点扩散函数的核心。
This paper revisits a sample of ultracool dwarfs in the solar neighborhood previously observed with the Hubble Space Telescope's NICMOS NIC1 instrument. We have applied a novel high angular resolution data analysis technique based on the extraction and fitting of kernel phases to archival data. This was found to deliver a dramatic improvement over earlier analysis methods, permitting a search for companions down to projected separations of ∼1 AU on NIC1 snapshot images. We reveal five new close binary candidates and present revised astrometry on previously known binaries, all of which were recovered with the technique. The new candidate binaries have sufficiently close separation to determine dynamical masses in a short-term observing campaign. We also present four marginal detections of objects which may be very close binaries or high-contrast companions. Including only confident detections within 19 pc, we report a binary fraction of at least . The results reported here provide new insights into the population of nearby ultracool binaries, while also offering an incisive case study of the benefits conferred by the kernel phase approach in the recovery of companions within a few resolution elements of the point-spread function core.