论文标题
舔卡内基系外行星的小行星拼贴
A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
论文作者
论文摘要
分析来自Lick Automated Planet Finder（APF）和Keck雇用的新的精确径向速度（RV）测量结果，已经发现了三个新的新型系外行星候选者，这些候选者以前没有报道过的两个附近的K矮人，以前没有报道过有伴侣（HD 190007＆HD 216520）。我们还报告了先前报道的行星宿主星GJ 686和HD 180617的APF和Planet Finder光谱仪（PFS）的新速度，并更新相应的外部外球体轨道模型。在新发现的行星中，HD 190007 b的期间为11.72天，RV半增长量为k = 5.64 $ \ pm $ 0.55 m s $ s $ s $^{ - 1} $，最低质量为16.46 $ \ pm $ 1.66 $ 1.66 $ \ $ \ $ \ pm \ pm \ pm \ rm rm rm rm _ r _ { （d = 12.7 PC）。 HD 216520 B的轨道周期为35.45天，RV半振幅为k = 2.28 $ \ pm $ 0.20 m s $ s $^{ - 1} $，最低质量为10.26 $ \ pm $ 0.99 $ 0.99 $ \ \ \ rm m rm m _ {\ oplus} $，而HD 216520 p = 154. k = 1.29 $ \ pm0.22 $ m s $^{ - 1} $，最小质量为9.44 $ \ pm $ 1.63 $ \ rm m _ {\ oplus} $。这两个行星都绕着略有金属贫困，无活跃的K0矮人星级HD 216520（d = 19.6 PC）。我们发现，我们最新的HD 180617 B和GJ 686 B的最新拟合模型与先前发表的结果非常吻合。对于HD 180617 b，我们获得105.91天的轨道周期，RV半增强k = 2.696 $ \ pm $ 0.22 m s $^{ - 1} $，最低质量为2.214 $ \ pm $ 1.05 $ \ $ \ rm \ rm \ rm m _ _ {\ oplus} $。对于GJ 686 b，我们发现轨道周期为15.53天，RV的半振幅为k = 3.00 $ \ pm $ 0.18 m s $ s $^{ - 1} $，最低质量为6.624 $ \ pm $ 0.432 $ \ rm m _ rm m_ _ {\ oplus} $。使用注射恢复练习，我们发现HD 190007 B和HD 216520 B不太可能在两个元素以内具有质量和轨道周期的其他行星，与$ \ sim $ 85 \％在此质量和周期范围内的$ \ sim $ 85 \％形成鲜明对比。
Analysis of new precision radial velocity (RV) measurements from the Lick Automated Planet Finder (APF) and Keck HIRES have yielded the discovery of three new exoplanet candidates orbiting two nearby K dwarfs not previously reported to have companions (HD 190007 & HD 216520). We also report new velocities from both the APF and the Planet Finder Spectrograph (PFS) for the previously reported planet host stars GJ 686 and HD 180617 and update the corresponding exoplanet orbital models. Of the newly discovered planets, HD 190007 b has a period of 11.72 days, an RV semi-amplitude of K = 5.64$\pm$0.55 m s$^{-1}$, a minimum mass of 16.46$\pm$1.66 $\rm M_{\oplus}$, and orbits the slightly metal-rich, active K4 dwarf star HD 190007 (d = 12.7 pc). HD 216520 b has an orbital period of 35.45 days, an RV semi-amplitude of K = 2.28$\pm$0.20 m s$^{-1}$, and a minimum mass of 10.26$\pm$0.99 $\rm M_{\oplus}$, while HD 216520 c has an orbital period of P = 154.43 days, an RV semi-amplitude of K = 1.29$\pm0.22$ m s$^{-1}$, and a minimum mass of 9.44$\pm$1.63 $\rm M_{\oplus}$. Both of these planets orbit the slightly metal-poor, inactive K0 dwarf star HD 216520 (d = 19.6 pc). We find that our updated best fit models for HD 180617 b and GJ 686 b are in good agreement with the previously published results. For HD 180617 b we obtain an orbital period of 105.91 days, an RV semi-amplitude of K = 2.696$\pm$0.22 m s$^{-1}$, and a minimum mass of 2.214$\pm$1.05 $\rm M_{\oplus}$. For GJ 686 b we find the orbital period to be 15.53 days, the RV semi-amplitude to be K = 3.00$\pm$0.18 m s$^{-1}$, and the minimum mass to be 6.624$\pm$0.432 $\rm M_{\oplus}$. Using an injection-recovery exercise, we find that HD 190007 b and HD 216520 b are unlikely to have additional planets with masses and orbital periods within a factor of two, in marked contrast to $\sim$85\% of planets in this mass and period range found with Kepler.
