利用孔径掩模干涉术和Palomar Laser导星自适应光学对L矮星的近伴搜索
A Close Companion Search around L Dwarfs using Aperture Masking Interferometry and Palomar Laser Guide Star Adaptive Optics
摘要：
我们提出了一个密切的同伴搜索周围16个已知的早期L矮星使用孔径掩模干涉术与帕洛玛激光导星自适应光学。孔径掩蔽的使用允许检测密近双星，对应于我们调查的目标的0.6-10.0 AU的投影物理分离。该测量在1.2 - 4 λ/D之间的分离达到了Δ_K ~ 2.3的中值对比度极限，在（2/3）λ/D处达到了Δ_K ~ 1.4的中值对比度极限。我们提出了四个候选二进制检测中到高的信心（90-98%）。两个预测的物理分离小于1.5 AU。这可能表明，紧密分离的双星贡献更显着的二进制部分比目前假设的，符合光谱和光度过光度研究。这次调查的十个目标以前已经被哈勃太空望远镜观测到，作为同伴搜索的一部分。我们使用增加的分辨率孔径掩蔽搜索关闭或昏暗的同伴，将被全孔径成像，找到两个候选双星。这次调查是第一次应用孔径掩模与激光导星自适应光学在帕洛玛。探讨了在低信噪比条件下分析孔径掩模数据的几种新技术。
英文摘要：
We present a close companion search around sixteen known early-L dwarfs using aperture masking interferometry with Palomar laser guide star adaptive optics. The use of aperture masking allows the detection of close binaries, corresponding to projected physical separations of 0.6-10.0 AU for the targets of our survey. This survey achieved median contrast limits of Delta_K ~ 2.3 for separations between 1.2 - 4 lambda/D, and Delta_K ~ 1.4 at (2/3)lambda/D. We present four candidate binaries detected with moderate to high confidence (90-98%). Two have projected physical separations less than 1.5 AU. This may indicate that tight-separation binaries contribute more significantly to the binary fraction than currently assumed, consistent with spectroscopic and photometric overluminosity studies. Ten targets of this survey have previously been observed with the Hubble Space Telescope as part of companion searches. We use the increased resolution of aperture masking to search for close or dim companions that would be obscured by full aperture imaging, finding two candidate binaries. This survey is the first application of aperture masking with laser guide star adaptive optics at Palomar. Several new techniques for the analysis of aperture masking data in the low signal to noise regime are explored.
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