A direct imaging search for close stellar and sub‐stellar companions to young nearby stars
A direct imaging search for close stellar and sub‐stellar companions to young nearby stars
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直接成像搜索邻近年轻恒星的近恒星和亚恒星伴星
DOI：
10.1002/asna.201412134
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发表时间：
2014
影响因子：
0.9
通讯作者：
Contreras-Quijada A.
中科院分区：
文献类型：
--
作者：
Vogt N;Mugrauer M;Neuhäuser R;Schmidt T.O.B;Contreras-Quijada A.
智利帕拉纳尔天文台的甚大望远镜的自适应光学成像仪Naos-Conica在Ks波段观测到了28颗年轻的邻近恒星（年龄≤ 6000万年）。在这些目标中，有10个视觉双星和一个距离在10到130 pc之间的三重系统，所有这些都是以前已知的。在第一个观测时期，在其中七个目标周围探测到了总共20颗微弱的恒星或亚恒星伴星候选者。这些场，以及大多数恒星双星，在第二个纪元，大约一年后，用相同的仪器重新观察到。本文给出了所有双星的天体测量观测结果。他们的分析显示，所有的恒星双星都是共同运动的。在两个案例中（HD 119022 AB和FG Aqr B/C）发现了显着轨道运动的迹象。然而，所有亚星伴星候选者都被证明是不移动的背景物体，除了PZ Tel，它是该项目的一部分，但其结果已在其他地方发表。探测极限被确定为所有的目标，并得出了极限质量采用三个不同的年龄值;他们原来是在大多数情况下小于10木星质量，远低于褐矮星的质量范围。恒星多重性的分数和在Chamaeleon的星星形成区域的亚恒星伴星的出现进行了比较，我们的搜索统计，并讨论了观察到的差异的可能原因。（© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
A total of 28 young nearby stars (ages ≤60 Myr) have been observed in theKs‐band with the adaptive optics imager Naos‐Conica of the Very Large Telescope at the Paranal Observatory in Chile. Among the targets are ten visual binaries and one triple system at distances between 10 and 130 pc, all previously known. During a first observing epoch a total of 20 faint stellar or sub‐stellar companion‐candidates were detected around seven of the targets. These fields, as well as most of the stellar binaries, were re‐observed with the same instrument during a second epoch, about one year later. We present the astrometric observations of all binaries. Their analysis revealed that all stellar binaries are co‐moving. In two cases (HD 119022 AB and FG Aqr B/C) indications for significant orbital motions were found. However, all sub‐stellar companion candidates turned out to be non‐moving background objects except PZ Tel which is part of this project but whose results were published elsewhere. Detection limits were determined for all targets, and limiting masses were derived adopting three different age values; they turn out to be less than 10 Jupiter masses in most cases, well below the brown dwarf mass range. The fraction of stellar multiplicity and of the sub‐stellar companion occurrence in the star forming regions in Chamaeleon are compared to the statistics of our search, and possible reasons for the observed differences are discussed. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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影响因子：
6.5
作者：
T. Schmidt;M. Mugrauer;R. Neuhauser;N. Vogt;S. Witte;P. Hauschildt;C. Helling;A. Seifahrt;A. I. U. Universitatssternwarte;Jena;H Germany;D. D. Astronom'ia-D.;Valpara'iso;Chile.;H. Sternwarte;S. O. Physics;Astronomy;S. Andrews;UK.;D. O. Astronomy;Astrophysics;Chicago.;Usa
通讯作者：
T. Schmidt;M. Mugrauer;R. Neuhauser;N. Vogt;S. Witte;P. Hauschildt;C. Helling;A. Seifahrt;A. I. U. Universitatssternwarte;Jena;H Germany;D. D. Astronom'ia-D.;Valpara'iso;Chile.;H. Sternwarte;S. O. Physics;Astronomy;S. Andrews;UK.;D. O. Astronomy;Astrophysics;Chicago.;Usa
Chamaeleon 恒星形成区年轻低质量双星和多个系统的天体测量确认
DOI：
10.1051/0004-6361/201118410
发表时间：
2012
期刊：
arXiv: Solar and Stellar Astrophysics
影响因子：
--
作者：
Vogt N;Schmidt T.O.B;Neuhäuser R;Bedalov A;Roell T;Seifahrt A;Mugrauer M.
通讯作者：
Mugrauer M.
双子座深行星巡天
DOI：
10.1086/522826
发表时间：
2007
期刊：
The Astrophysical Journal
影响因子：
--
作者：
D. Lafreniére;R. Doyon;C. Marois;D. Nadeau;B. Oppenheimer;P. Roche;F. Rigaut;J. Graham;R. Jayawardhana;D. Johnstone;P. Kalas;B. Macintosh;R. Racine
通讯作者：
R. Racine
DOI：
10.1088/0067-0049/211/2/25
发表时间：
2014-03
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
Christine H. Chen;T. Mittal;M. Kuchner;W. Forrest;C. Lisse;P. Manoj;B. Sargent;D. Watson
通讯作者：
Christine H. Chen;T. Mittal;M. Kuchner;W. Forrest;C. Lisse;P. Manoj;B. Sargent;D. Watson
双子座深行星巡天 – GDPS 1
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
D. Lafreniére;R. Doyon;C. Marois;D. Nadeau;B. Oppenheimer;P. Roche;F. Rigaut;J. Graham;R. Jayawardhana;D. Johnstone;P. Kalas;B. Macintosh;R. Racine
通讯作者：
R. Racine