论文标题
围绕低亮度巨星的四个jovian行星，由表达和PPP观察到
Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
论文作者
论文摘要
我们报告了绕着1.04至1.39 m $ $ $ _ \ odot $在1.04至1.39 m $ _ \ odot $之间的四个低亮度巨星的行星伴侣的发现。所有四个宿主恒星都被围绕进化的恒星（Express）程序和泛太平洋行星搜索（PPP）独立观察到。伴侣信号通过在近十年中获得的多上两口精度径向速度揭示。行星伴侣展示了$ \ sim $ 1.2至7。1年之间的轨道周期，最低质量为m $ _ {\ rm p} $ sini $ \ sim $ \ sim $ 1.8-3.7 m $ _ {jup} $，偏心率在0.08和0.42之间。包括这四个新系统，我们已经检测到了37个巨星中的11个，这是Express和PPP之间常见目标的11个。在从共同样本中排除了四个紧凑的二进制文件之后，我们获得了一小部分巨型行星（m $ _ {\ rm p} \ gtrsim $ 1-2 m $ \ _ {jup} $）在5 au中从其父母的$ f = 33.3^{+9.0} {+9.0} _ {+9.0} _ 7.1 _ {-7.1 _ {-7.1 = -5 au中的父级。该分数明显高于文献中先前通过不同的径向速度调查报道的分数。同样，在恒星周围的气体巨人比太阳更大的恒星围绕恒星的比例。
We report the discovery of planetary companions orbiting four low-luminosity giant stars with M$_\star$ between 1.04 and 1.39 M$_\odot$. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch precision radial velocities obtained during nearly a decade. The planetary companions exhibit orbital periods between $\sim$ 1.2 and 7.1 years, minimum masses of m$_{\rm p}$sini $\sim$ 1.8-3.7 M$_{jup}$ and eccentricities between 0.08 and 0.42. Including these four new systems, we have detected planetary companions to 11 out of the 37 giant stars that are common targets between the EXPRESS and PPPS. After excluding four compact binaries from the common sample, we obtained a fraction of giant planets (m$_{\rm p} \gtrsim$ 1-2 M$\_{jup}$) orbiting within 5 AU from their parent star of $f = 33.3^{+9.0}_{-7.1} \%$. This fraction is significantly higher than that previously reported in the literature by different radial velocity surveys. Similarly, planet formation models under predict the fraction of gas giant around stars more massive than the Sun.
