半人马座$α$ AB系统的精密毫米波天体测量
Precision Millimeter Astrometry of the $α$ Centauri AB System
摘要：
半人马座$α$ A是距离太阳最近的太阳型恒星，它提供了最好的机会来发现并最终确定位于其宜居带（HZ）的地球大小的行星。在这里，我们描述了从ALMA计划，以寻找行星的$α$岑AB系统使用差分天文测量毫米波长的初步结果。我们的初步结果包括新的绝对天体测量的自行，轨道运动，视差的$α$岑系统。这些导致对$α$ Cen A和B的物理性质的更好的了解。我们对ALMA的相对天体测量精度的估计表明，我们最终将对1-3 AU轨道上的几十个地球质量的行星敏感，那里被认为存在稳定的轨道。
英文摘要：
$α$ Centauri A is the closest solar-type star to the Sun and offers the best opportunity to find and ultimately to characterize an Earth-sized planet located in its Habitable Zone (HZ). Here we describe initial results from an ALMA program to search for planets in the $α$ Cen AB system using differential astrometry at millimeter wavelengths. Our initial results include new absolute astrometric measurements of the proper motion, orbital motion, and parallax of the $α$ Cen system. These lead to an improved knowledge of the physical properties of both $α$ Cen A and B. Our estimates of ALMA's relative astrometric precision suggest that we will ultimately be sensitive to planets of a few 10s of Earth mass in orbits from 1-3 AU, where stable orbits are thought to exist.
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