SIM PlanetQuest关键项目前兆观测探测年轻恒星周围的气体巨行星
SIM PlanetQuest Key Project Precursor Observations to Detect Gas Giant Planets Around Young Stars
摘要：
我们提出了一个审查的SIM PlanetQuest关键项目致力于检测木星质量的行星周围的年轻恒星的前兆观测计划。为了确保样本中的恒星不受可能妨碍行星探测的各种天体测量噪声源的影响，我们已经启动了收集北半球和南半球恒星测光、高对比度图像、干涉测量数据和径向速度的计划。我们已经完成了金牛座和昂宿星的目标恒星的高对比度成像调查，并发现没有明确的共同自行同伴在一个角秒（140 AU）的SIM目标。我们的视向速度测量显示，天蝎座的许多目标恒星都是快速旋转的，金牛座和昂宿星团中的一些恒星可能有亚恒星伴星。金牛座中几颗恒星的干涉测量数据显示，没有任何恒星或亚恒星伴星的迹象，其间距小于5质量。光度测量表明，最初为这个计划选择的恒星中，大约有一半的恒星的变化程度（1 sigma>0.1等）会降低该恒星的天体测量精度。虽然前体计划仍在进行中，但我们提供了一份全面的目标清单，根据迄今为止的观察结果，根据其可行性进行了排名。到目前为止，从SIM-YSO计划中移动最多目标的可观测性是光度变化。
英文摘要：
We present a review of precursor observing programs for the SIM PlanetQuest Key project devoted to detecting Jupiter mass planets around young stars. In order to ensure that the stars in the sample are free of various sources of astrometric noise that might impede the detection of planets, we have initiated programs to collect photometry, high contrast images, interferometric data and radial velocities for stars in both the Northern and Southern hemispheres. We have completed a high contrast imaging survey of target stars in Taurus and the Pleiades and found no definitive common proper motion companions within one arcsecond (140 AU) of the SIM targets. Our radial velocity surveys have shown that many of the target stars in Sco-Cen are fast rotators and a few stars in Taurus and the Pleiades may have sub-stellar companions. Interferometric data of a few stars in Taurus show no signs of stellar or sub-stellar companions with separations of <5 mas. The photometric survey suggests that approximately half of the stars initially selected for this program are variable to a degree (1 sigma>0.1 mag) that would degrade the astrometric accuracy achievable for that star. While the precursor programs are still a work in progress, we provide a comprehensive list of all targets ranked according to their viability as a result of the observations taken to date. By far, the observable that moves the most targets from the SIM-YSO program is photometric variability.
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