论文标题
苔丝发现一个轨道轨道轨道轨道中间矮小的TOI-2136
TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136
论文作者
论文摘要
我们介绍了TOI-2136b的发现，Toi-2136b是每7.85天的次纳维星行星，附近是M4.5V型恒星，该星星通过TESS任务的光度测量结果确定。主机之星的位置为$ 33 $ PC，半径为$ r _ {\ ast} = 0.34 \ pm0.02 \ r _ {\ odot} $，质量为$ 0.34 \ pm0.02 \ m _ {\ odot} $，有效温度和有效温度为$ \ rm 3342 \ pm100 \ k =我们估计其出色的轮换期为$ 75 \ pm5 $天数，基于档案长期光度法。我们基于一系列地面多波长光度法，高角度分辨率成像观测值以及来自CFHT/Spirou的精确径向速度来确认并表征行星。我们的联合分析表明，行星的半径为$ 2.19 \ pm0.17 \ r _ {\ oplus} $，质量测量为$ 6.4 \ pm2.4 \ m _ {\ oplus} $。 TOI2136B的质量和半径与从水冰到以气体为主的世界的各种成分一致。 TOI-2136B落在由热驱动的大气质量损失模型预测的低质量恒星的Radius Valley附近，这使其成为将来研究其内部结构和大气特性的有趣目标。
We present the discovery of TOI-2136b, a sub-Neptune planet transiting every 7.85 days a nearby M4.5V-type star, identified through photometric measurements from the TESS mission. The host star is located $33$ pc away with a radius of $R_{\ast} = 0.34\pm0.02\ R_{\odot}$, a mass of $0.34\pm0.02\ M_{\odot}$ and an effective temperature of $\rm 3342\pm100\ K$. We estimate its stellar rotation period to be $75\pm5$ days based on archival long-term photometry. We confirm and characterize the planet based on a series of ground-based multi-wavelength photometry, high-angular-resolution imaging observations, and precise radial velocities from CFHT/SPIRou. Our joint analysis reveals that the planet has a radius of $2.19\pm0.17\ R_{\oplus}$, and a mass measurement of $6.4\pm2.4\ M_{\oplus}$. The mass and radius of TOI2136b is consistent with a broad range of compositions, from water-ice to gas-dominated worlds. TOI-2136b falls close to the radius valley for low-mass stars predicted by the thermally driven atmospheric mass loss models, making it an interesting target for future studies of its interior structure and atmospheric properties.
