论文标题
radial速度搜索和统计研究的短周期行星pleiades开放群集
Radial-velocity search and statistical studies for short-period planets in the Pleiades open cluster
论文作者
论文摘要
我们报告了radial速度搜索在pleiades开放群集中的短期行星。我们在冈山天体物理天文台（OAO）上观察到30个PLEIADES恒星，具有高分散层梯形光谱仪（HIDES）。为了评估和减轻恒星活动对径向速度测量值的影响，我们计算了四个活动指标（fwhm，$ v _ {\ rm span} $，$ w _ {\ rm span} $和$ s _ {\ rmhα} $）。在我们的样本中，未检测到未检测到的短期候选行星。据估计，恒星固有的RV抖动为$ {\ rm 52 \ m \，s^{ - 1}} $，$ {\ rm 128 \ m \，s^{ - 1}} $和$ {\ rm 173 \ rm 173 \ m \ m \ m \ m \，s^{ - 1} $ for $ v for $ v of sin $ v \ f of sin i i \ sin I i \ rm rm i v \ sin i i \ sin i i \ sin i i \ rm rm i v \ rm rm i v \ rm rm i v• km \，s^{ - 1}} $，$ {\ rm 15 \ km \，s^{ - 1}} $和$ {\ rm 20 \ km \，s^{ - 1}} $分别。我们从调查中确定了行星的发生率，并将上限设置为质量为1--13 $ M _ {\ rm jup} $的行星的上限为11.4 \％，并将上限设置为1--10天。为了对行星的发生率设置更严格的约束，我们将调查的结果与针对开放群体的其他调查的结果结合在一起，年龄在30--300 MYR之间。结果，发现年轻开放簇中的行星发生率小于7.4 \％，2.9 \％和1.9 \％的行星，轨道周期为三天，质量为1--5、5--13和13---80 $ M _ {\ rm jup} $，分别为三天，质量为1--5、5--13和13--5--13和13---80 $。
We report radial-velocity search for short-period planets in the Pleiades open cluster. We observed 30 Pleiades member stars at the Okayama Astrophysical Observatory (OAO) with High Dispersion Echelle Spectrograph (HIDES). To evaluate and mitigate the effects of stellar activity on radial-velocity measurements, we computed four activity indicators (FWHM, $V_{\rm span}$, $W_{\rm span}$ and $S_{\rm Hα}$). Among our sample, no short-period planet candidates were detected. Stellar intrinsic RV jitter was estimated to be ${\rm 52\ m\,s^{-1}}$, ${\rm 128\ m\,s^{-1}}$ and ${\rm 173\ m\,s^{-1}}$ for stars with $v\sin i$ of ${\rm 10\ km\,s^{-1}}$, ${\rm 15\ km\,s^{-1}}$ and ${\rm 20\ km\,s^{-1}}$, respectively. We determined the planet occurrence rate from our survey and set the upper limit to 11.4\% for the planets with masses 1--13 $M_{\rm JUP}$ and period 1--10 days. To set a more stringent constraint on the planet occurrence rate, we combined the result of our survey with those of other surveys targeting open clusters with ages between 30--300 Myr. As a result, the planet occurrence rate in young open clusters was found to be less than 7.4\%, 2.9\% and 1.9\% for the planets with an orbital period of three days and masses between 1--5, 5--13, and 13--80 $M_{\rm JUP}$, respectively.
