NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION
NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION
复制标题
T Cha 过渡盘的新空间分辨观测以及对先前声称的恒星伴星的限制
DOI：
10.1088/0004-637x/801/2/85
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Xompero
中科院分区：
文献类型：
--
作者：
S. Sallum;J. Eisner;L. Close;P. Hinz;A. Skemer;V. Bailey;R. Briguglio;K. Follette;J. Males;K. Morzinski;A. Puglisi;T. Rodigas;A. Weinberger;M. Xompero
我们提出了T Cha过渡盘的多历元非冗余掩蔽观测，在甚大望远镜和麦哲伦在H，Ks和L′波段。T Cha是通过高分辨率成像技术发现的少数过渡盘之一，其位置角为78°，分离度为62 mas，对比度为ΔL′ = 5.1 ma。我们在重新还原的初始探测图像中发现了可比的二进制参数，并且在2011 L′，2013纳科L′，和2013年纳科Ks数据集。我们在2012年的纳科L′数据集中发现了一个无法用轨道运动解释的近距离伴随信号，而在2013年的MagAO/Clio 2 L′数据中没有检测到。然而，蒙特卡罗模拟显示，2012年纳科和2013年MagAO/Clio 2随访数据的最佳拟合可能与噪声一致。在这两个数据集中也有很大的可能性是错误的未检测。我们讨论了可能导致最佳拟合的物理场景，并认为以前的同伴和散射解释与这里提出的更大的数据集的结果不一致。
We present multi-epoch non-redundant masking observations of the T Cha transition disk, taken at the Very Large Telescope and Magellan in the H, Ks, and L′ bands. T Cha is one of a small number of transition disks that host companion candidates discovered by high-resolution imaging techniques, with a putative companion at a position angle of 78°, separation of 62 mas, and contrast of ΔL′ = 5.1 mag. We find comparable binary parameters in our re-reduction of the initial detection images, and similar parameters in the 2011 L′, 2013 NaCo L′, and 2013 NaCo Ks data sets. We find a close-in companion signal in the 2012 NaCo L′ data set that cannot be explained by orbital motion, and a non-detection in the 2013 MagAO/Clio2 L′ data. However, Monte Carlo simulations show that the best fits to the 2012 NaCo and 2013 MagAO/Clio2 followup data may be consistent with noise. There is also a significant probability of false non-detections in both of these data sets. We discuss physical scenarios that could cause the best fits, and argue that previous companion and scattering explanations are inconsistent with the results of the much larger data set presented here.
影响因子：
6.5
作者：
E. Schisano;E. Covino;J. Alcalá;M. Esposito;D. Gandolfi;E. Guenther
通讯作者：
E. Schisano;E. Covino;J. Alcalá;M. Esposito;D. Gandolfi;E. Guenther