来自Keck & Lick径向速度巡天的14颗新伴星，包括5颗褐矮星候选者
Fourteen New Companions from the Keck & Lick Radial Velocity Survey Including Five Brown Dwarf Candidates
摘要：
我们目前的径向速度为14颗恒星在加利福尼亚州和卡内基行星搜索的目标名单，揭示新的同伴。其中一颗恒星HD 167665符合开普勒轨道，其伴星的最小质量为50.3 Mjup，与主星的距离约为5.5 AU。其余13颗恒星的相位覆盖不完整或有限，使我们无法为它们分配独特的轨道参数。相反，我们在Msini和周期P的固定值的网格上用开普勒轨道拟合它们的径向速度，并使用由此产生的约化卡方表面来对Msini，P和半长轴a施加约束。这种技术使我们能够将Msini限制在棕矮星-恒星质量边界以下，另外4个同伴（HD 150554，HD 8765，HD 72780，HD 74014）。如果这5颗伴星被确认为棕矮星，这些结果将包括我们在3 AU以外的调查中首次捕获的此类天体。
英文摘要：
We present radial velocities for 14 stars on the California & Carnegie Planet Search target list that reveal new companions. One star, HD 167665, was fit with a definitive Keplerian orbit leading to a minimum mass for the companion of 50.3 Mjup at a separation from its host of ~5.5 AU. Incomplete or limited phase coverage for the remaining 13 stars prevents us from assigning to them unique orbital parameters. Instead, we fit their radial velocities with Keplerian orbits across a grid of fixed values for Msini and period, P, and use the resulting reduced chi-square surface to place constraints on Msini, P, and semimajor axis, a. This technique allowed us to restrict Msini below the brown dwarf -- stellar mass boundary for an additional 4 companions (HD 150554, HD 8765, HD 72780, HD 74014). If the combined 5 companions are confirmed as brown dwarfs, these results would comprise the first major catch of such objects from our survey beyond ~3 AU.
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