超冷场使加拿大-法国褐矮星调查的光度函数相形见绌

C. Reylé, P. Delorme, X. Delfosse, T. Forveille, C. Willott, L. Albert, É. Artigau
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引用次数: 0

摘要

加拿大-法国褐矮星调查是一项广泛的低温褐矮星调查,由CFHT望远镜上的MegaCam相机进行。我们的目标是找到超冷褐矮星,并从大量均匀的L和T矮星样本中约束场褐矮星质量函数。我们在CFHT/Megacam i '和z '图像中识别候选者,并在几台望远镜上使用近红外定点成像进行跟踪。迄今为止,我们的调查已经发现了50个T矮星候选者和170个L或晚M矮星候选者,这些候选者是从1300个典型的超冷矮星i '‐z '颜色的候选者中抽取的,发现于900平方度的范围内。目前,我们已经完成了对所有候选者的大部分近红外跟踪调查,从已知的最新T矮星到晚L色范围。这使我们能够建立一个完整的、定义良好的超冷矮星样本来研究场L和T矮星的光度函数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The ultracool field dwarfs luminosity function from the Canada‐France Brown Dwarf Survey
The Canada‐France Brown Dwarf Survey is a wide field survey for cool brown dwarfs conducted with the MegaCam camera on the CFHT telescope. Our objectives are to find ultracool brown dwarfs and to constrain the field brown dwarf mass function from a large and homogeneous sample of L and T dwarfs. We identify candidates in CFHT/Megacam i’ and z’ images and follow them up with pointed NIR imaging on several telescopes. Our survey has to date found 50 T dwarfs candidates and 170 L or late M dwarf candidates drawn from a larger sample of 1300 candidates with typical ultracool dwarfs i’‐z’ colours, found in 900 square degrees. We currently have completed the NIR follow‐up on a large part of the survey for all candidates from the latest T dwarfs known to the late L color range. This allows us to build on a complete and well defined sample of ultracool dwarfs to investigate the luminosity function of field L and T dwarfs.
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