标题： 一个迷你海王星和一个金星区行星在半径谷中围绕近距M2型矮星TOI-1266运行：利用宜居区行星探测器进行验证 显示英文标题

标题： A Mini-Neptune and a Venus-Zone Planet in the Radius Valley Orbiting the Nearby M2-dwarf TOI-1266: Validation with the Habitable-zone Planet Finder

摘要： 我们报告了对由TESS任务观测的附近（36pc）M2型矮星TOI-1266绕行的两颗行星的验证。 内行星是亚海王星大小（$R=2.46 \pm 0.08 R_\oplus$）的行星，轨道周期为10.9天。 外行星的半径为$1.67_{-0.11}^{+0.09} R_\oplus$，并位于系外行星半径谷——岩石行星和气态行星之间的过渡区域。 轨道周期为18.8天，外行星接收到的照射通量是地球的2.4倍，类似于金星的照射通量。 使用Habitable-zone Planet Finder光谱仪的高精度近红外径向速度，我们在95%置信度下分别为内行星和外行星设定了质量上限$15.9 M_\oplus$和$6.4 M_\oplus$。 对于行星c更精确的质量限制，考虑到恒星亮度（V=12.9，J=9.7），当前的RV仪器可以实现，这将有助于进一步了解塑造系外行星半径谷的主要过程。 显示英文摘要

摘要： We report on the validation of two planets orbiting the nearby (36pc) M2 dwarf TOI-1266 observed by the TESS mission. The inner planet is sub-Neptune-sized ($R=2.46 \pm 0.08 R_\oplus$) with an orbital period of 10.9 days. The outer planet has a radius of $1.67_{-0.11}^{+0.09} R_\oplus$ and resides in the exoplanet Radius Valley---the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of $15.9 M_\oplus$ and $6.4 M_\oplus$ at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of planet c, achievable with current RV instruments given the host star brightness (V=12.9, J=9.7), will yield further insights into the dominant processes sculpting the exoplanet Radius Valley.