论文标题
3-D选择了167个附近星星的子星伴侣
3-D selection of 167 sub-stellar companions to nearby stars
论文作者
论文摘要
我们分析了5108个具有至少五个高精度径向速度点的AFGKM恒星以及Gaia和Hipparcos星体数据，利用了先前工作中开发的新管道。我们发现914个径向速度信号的周期大于1000 \，d。在这些信号周围，通过径向速度，天体测量和成像数据的组合分析来鉴定167个冷巨人和68种其他类型的伴侣。在没有纠正检测偏差的情况下，我们估计宽轨棕色矮人的最小发生率为1.3 \％，并找到一个明显的棕色矮山谷，约40美元$ m _ {\ rm jup} $。我们还发现，宿主二元分数超过3 au的幂律分布类似于单颗恒星，这表明对棕色矮人没有多重性的偏爱。我们的工作还揭示了九个子固有系统（GJ 234 B，GJ 494 B，HD 13724 B，HD 182488 B，HD 39060 B和C，HD 4113 C，HD 42581 D，HD 42581 D，HD 7449 B，和HD 984 B）以前直接在现有的设施中，并且在许多其他现有设施中都在现有。根据他们的年龄，我们估计，可以使用当前的成像设施检测到样品中的另外10-57个子遗迹对象，从而将成像的冷（或旧）巨头扩展到一个数量级。
We analyze 5108 AFGKM stars with at least five high precision radial velocity points as well as Gaia and Hipparcos astrometric data utilizing a novel pipeline developed in previous work. We find 914 radial velocity signals with periods longer than 1000\,d. Around these signals, 167 cold giants and 68 other types of companions are identified by combined analyses of radial velocity, astrometry, and imaging data. Without correcting for detection bias, we estimate the minimum occurrence rate of the wide-orbit brown dwarfs to be 1.3\%, and find a significant brown dwarf valley around 40 $M_{\rm Jup}$. We also find a power-law distribution in the host binary fraction beyond 3 au similar to that found for single stars, indicating no preference of multiplicity for brown dwarfs. Our work also reveals nine sub-stellar systems (GJ 234 B, GJ 494 B, HD 13724 b, HD 182488 b, HD 39060 b and c, HD 4113 C, HD 42581 d, HD 7449 B, and HD 984 b) that have previously been directly imaged, and many others that are observable at existing facilities. Depending on their ages we estimate that an additional 10-57 sub-stellar objects within our sample can be detected with current imaging facilities, extending the imaged cold (or old) giants by an order of magnitude.
