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arXiv 1806.08050astro-ph.IMastro-ph.EP
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便携式自适应光学用于系外行星成像

Portable Adaptive Optics for Exoplanet Imaging

Las Campanas Observatory Carnegie Institution of Washington(卡内基科学研究所拉斯坎帕纳斯天文台)

Yongtian Zhu, Jiangpei Dou, Xi Zhang, Gang Zhao, Jing Guo, Leopoldo Infante

AI总结:

便携式自适应光学系统实现中等望远镜系外行星直接成像,通过高对比度成像技术揭示已知系外行星κ And b。

摘要:

便携式自适应光学(PAO)是一种低成本且紧凑的系统,专为没有自适应光学(AO)的4米级望远镜设计,因为Nasmyth或Cassegrain焦点处存在物理空间限制以及传统AO的历史高成本。PAO的初步科学观测重点是直接成像系外行星和亚恒星伴星。本文讨论了PAO的概念以及我们最近观测运行中相关的高对比度成像性能。PAO在中等见度条件下(1角秒)在H波段能够提供超过60%的斯特里尔比率。结合我们专门的图像旋转和减法(IRS)技术以及优化的IRS(O-IRS)算法,对于主星亮度为5≤V_mag≤9的恒星,在7分钟和2小时的曝光时间内,平均对比度比分别为1.3×10⁻⁵和3.3×10⁻⁶,在0.36角秒的角距离处。PAO在最近的观测中成功揭示了已知的系外行星κ And b,在3.5米ARC望远镜(Apache Point Observatory)的观测中。我们对恢复的κ And b行星进行了相关的天体测量和光度分析,得出其投影分离为0.984±0.05角秒,位置角为51.1±0.5度,质量为10.15_{-1.255}^{+2.19}M_Jup。这些结果表明,PAO可以用于中等大小望远镜的系外行星直接成像。

英文摘要:

The Portable Adaptive Optics (PAO) is a low-cost and compact system, designed for 4-meter class telescopes that have no Adaptive Optics (AO), because of the physical space limitation at the Nasmyth or Cassegrain focus and the historically high cost of the conventional AO. The initial scientific observations of the PAO are focused on the direct imaging of exoplanets and sub-stellar companions. This paper discusses the PAO concept and the associated high-contrast imaging performance in our recent observational runs. PAO is delivering a Strehl ratio better than $60\%$ in $H$ band under median seeing conditions of $1 ''$. Combined with our dedicated image rotation and subtraction (IRS) technique and the optimized IRS (O-IRS) algorithm, the averaged contrast ratio for a $5\leq V\rm_{mag} \leq 9$ primary star is $1.3 \times 10^{-5}$ and $3.3 \times 10^{-6}$ at angular distance of $0.36 ''$ under exposure time of 7 minutes and 2 hours, respectively. PAO has successfully revealed the known exoplanet of $κ$ And b, in our recent observation at 3.5-meter ARC telescope at Apache Point Observatory. We have performed the associated astrometry and photometry analysis of the recovered $κ$ And b planet, which gives a projected separation of $0.984 \pm 0.05 ''$, a position angle of $51.1 \pm 0.5^{\circ}$, and a mass of $10.15_{-1.255}^{+2.19}M_{\rm Jup}$. These results demonstrate that PAO can be used for direct imaging of exoplanets with medium-sized telescopes.

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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