arXiv 0903.44882009-03-25astro-ph.GAastro-ph.IM

用一个小的，校正良好的望远镜孔径成像靠近明亮恒星的微弱褐矮星同伴

Imaging faint brown dwarf companions close to bright stars with a small, well-corrected telescope aperture

E. Serabyn, D. Mawet, E. Bloemhof, P. Haguenauer, B. Mennesson, K. Wallace, J. Hickey

备注：: accepted for publication in the Astrophysical Journal
发表信息：: Astrophys.J.696:40-46,2009
DOI：: 10.1088/0004-637X/696/1/40

摘要：

我们已经使用了我们的1.6米直径的离轴良好校正的子孔径（WCS）的帕洛玛黑尔望远镜在音乐会上与一个小的内部工作角（IWA）相位掩模日冕成像的一小部分附近的恒星的直接周围。测试案例包括三颗恒星（HD 130948，HD 49197和HR 7672），它们都有已知的棕矮星伴星，距离很小，所有这些都被探测到。我们还提出了一个新的对象接近附近的年轻G0V星HD 171488的初步检测。后续观测需要确定这个天体是否是一个真正的伴星，但它的通量与年轻的棕矮星或低质量M星的通量一致，与主星的距离相同。有趣的是，在小角度下，我们的WCS日冕仪展示了一个有限的可检测对比度，与现有的Lyot日冕仪在更大的望远镜上用当前一代AO系统校正的对比度相当。这表明，修正到极端自适应光学（ExAO）水平的小孔径可以用于对近距离棕矮星和恒星伴星进行初步调查，将后续观测留给更大的望远镜。

英文摘要：

We have used our 1.6 m diameter off-axis well-corrected sub-aperture (WCS) on the Palomar Hale telescope in concert with a small inner-working-angle (IWA) phase-mask coronagraph to image the immediate environs of a small number of nearby stars. Test cases included three stars (HD 130948, HD 49197 and HR7672) with known brown dwarf companions at small separations, all of which were detected. We also present the initial detection of a new object close to the nearby young G0V star HD171488. Follow up observations are needed to determine if this object is a bona fide companion, but its flux is consistent with the flux of a young brown dwarf or low mass M star at the same distance as the primary. Interestingly, at small angles our WCS coronagraph demonstrates a limiting detectable contrast comparable to that of extant Lyot coronagraphs on much larger telescopes corrected with current-generation AO systems. This suggests that small apertures corrected to extreme adaptive optics (ExAO) levels can be used to carry out initial surveys for close brown dwarf and stellar companions, leaving followup observations for larger telescopes.

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