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arXiv 1807.08799astro-ph.EPastro-ph.SR
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WEIRD:利用InfraRed直接成像进行宽轨道系外行星搜索

WEIRD: Wide-orbit Exoplanet search with InfraRed Direct imaging

Frédérique Baron, Étienne Artigau, Julien Rameau, David Lafrenière, Jonathan Gagné, Lison Malo, Loïc Albert, Marie-Eve Naud, René Doyon, Markus Janson, Philippe… 展开作者

Frédérique Baron, Étienne Artigau, Julien Rameau, David Lafrenière, Jonathan Gagné, Lison Malo, Loïc Albert, Marie-Eve Naud, René Doyon, Markus Janson, Philippe Delorme, Charles Beichman

摘要:

我们报告的结果,从宽轨道系外行星搜索与红直接成像(WEIRD),调查旨在寻找非常宽的轨道(1000至5000 AU)周围的年轻恒星($<$ 120百万年),是已知的成员在太阳附近的移动群体($<$ 70 pc)的彗星般的同伴。与它们的宿主共享相同的年龄、距离和金属丰度,同时又处于足够大的轨道上,可以作为“孤立”物体进行研究,这使得这些同伴成为光谱观测的主要目标,也是系外行星大气模型的有价值的基准物体。搜索策略基于近红外域多个波段的深度成像。对于我们样本的所有177个对象,使用CFHT/MegaCam、GEMINI/GMOS、CFHT/WIRCam、GEMINI/Flamingos-2和$Spitzer$ /IRAC获得了$z_{ab}^\prime$、$J$ [3.6]和[4.5]图像。使用这组每个目标4张图像,我们搜索了具有红色$z_{ab}^\prime$和$[3.6]-[4.5]$颜色的源,通常在$1000-5000$ AU的分离下,达到良好的完整性,直到2 Mjup的伴随物,而对于一些目标,达到1 Mjup。搜索产生了4个候选同伴与预期的颜色,但他们都被拒绝通过后续的自行观察。我们的研究结果限制了1-13 Mjup行星质量的同伴在轨道上的半长轴在1000和5000 AU之间小于0.03,置信水平为95%。

英文摘要:

We report results from the Wide-orbit Exoplanet search with InfraRed Direct imaging (WEIRD), a survey designed to search for Jupiter-like companions on very wide orbits (1000 to 5000 AU) around young stars ($<$120 Myr) that are known members of moving groups in the solar neighborhood ($<$70 pc). Sharing the same age, distance, and metallicity as their host while being on large enough orbits to be studied as "isolated" objects make such companions prime targets for spectroscopic observations and valuable benchmark objects for exoplanet atmosphere models. The search strategy is based on deep imaging in multiple bands across the near-infrared domain. For all 177 objects of our sample, $z_{ab}^\prime$, $J$, [3.6] and [4.5] images were obtained with CFHT/MegaCam, GEMINI/GMOS, CFHT/WIRCam, GEMINI/Flamingos-2, and $Spitzer$/IRAC. Using this set of 4 images per target, we searched for sources with red $z_{ab}^\prime$ and $[3.6]-[4.5]$ colors, typically reaching good completeness down to 2Mjup companions, while going down to 1Mjup for some targets, at separations of $1000-5000$ AU. The search yielded 4 candidate companions with the expected colors, but they were all rejected through follow-up proper motion observations. Our results constrain the occurrence of 1-13 Mjup planetary-mass companions on orbits with a semi-major axis between 1000 and 5000 AU at less than 0.03, with a 95\% confidence level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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