一颗可能的巨行星在Beta Picture盘中成像
A probable giant planet imaged in the Beta Pictoris disk
摘要：
自从1984年发现它的尘埃盘以来，美如画β已经成为年轻的早期型行星系统的原型，现在有各种迹象表明，一颗巨大的木星行星在大约10天文单位的轨道上绕着它运行。然而，到目前为止，还没有发现这颗恒星周围的行星。我们的目标是调查Beta Pic的近距离环境，寻找行星伴侣。Beta Pic的深度自适应光学L '波段图像是使用甚大望远镜的NaCo仪器记录的。一个微弱的点状信号在距离恒星约8天文单位的投影距离处被探测到，位于尘埃盘的东北侧。进行了各种测试，以排除具有良好置信度的可能的仪器或大气伪影。前景或背景污染物的可能性非常低，另外基于对哈勃太空望远镜先前深空图像的分析。L'=11.2视星等的天体，其典型温度约为1500 K，质量约为8个木星质量。如果得到证实，它可以解释Beta Pic系统的主要形态和动力学特性。目前的探测是A星中唯一的，因为被解析的行星靠近它的母星。它在Beta Pic盘内的位置和距离表明它是由核心吸积或盘的不稳定性形成的，而不是类似双星的形成过程。
英文摘要：
Since the discovery of its dusty disk in 1984, Beta Pictoris has become the prototype of young early-type planetary systems, and there are now various indications that a massive Jovian planet is orbiting the star at ~ 10 AU. However, no planets have been detected around this star so far. Our goal was to investigate the close environment of Beta Pic, searching for planetary companion(s). Deep adaptive-optics L'-band images of Beta Pic were recorded using the NaCo instrument at the Very Large Telescope. A faint point-like signal is detected at a projected distance of ~ 8 AU from the star, within the North-East side of the dust disk. Various tests were made to rule out with a good confidence level possible instrumental or atmospheric artifacts. The probability of a foreground or background contaminant is extremely low, based in addition on the analysis of previous deep Hubble Space Telescope images. The object L'=11.2 apparent magnitude would indicate a typical temperature of ~1500 K and a mass of ~ 8 Jovian masses. If confirmed, it could explain the main morphological and dynamical peculiarities of the Beta Pic system. The present detection is unique among A-stars by the proximity of the resolved planet to its parent star. Its closeness and location inside the Beta Pic disk suggest a formation process by core accretion or disk instabilities rather than a binary-like formation process.
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