TESS寻找年轻和成熟的系外行星（THYME）II：一颗1700万年前在Sco-Cen星协中凌日的热木星
TESS Hunt for Young and Maturing Exoplanets (THYME) II: A 17 Myr Old Transiting Hot Jupiter in the Sco-Cen Association
摘要：
我们提出了一个过境热木星轨道HIP 67522（$T_{eff}\sim5650$ K; $M_* \sim 1.2 M_{\odot}$）在10-20万年的斯科-岑OB协会的发现。我们使用自定义陷波滤波器行星搜索管道识别了TESS数据中的凌日，并使用Spitzer的额外测光，SOAR/Goodman，SALT/HRS，LCOGT/NRES和SMARTS/CHIRON的光谱学以及SOAR/HRCam的散斑成像来表征系统。我们的测光模型作为一个周期性的高斯过程与过境占恒星的变化，并找到一个轨道周期为6.9596 $^{+0.000016}_{-0.000015}$天和半径为10.02 $^{+0.54}_{-0.53}$ R $_\oplus$。我们还确定了一个额外的候选行星的半径为8.01 $^{+0.75}_{-0.71}$ R $_\oplus$，轨道周期为$\gtrsim23$天的一个单一的过境。HIP 67522 b是目前发现的最年轻的凌日热木星，是透射光谱和径向速度后续研究的理想候选者，同时也表明一些年轻的巨行星要么在小轨道半径处原位形成，要么从盘中更远的形成地点迅速迁移。
英文摘要：
We present the discovery of a transiting hot Jupiter orbiting HIP 67522 ($T_{eff}\sim5650$ K; $M_* \sim 1.2 M_{\odot}$) in the 10-20 Myr old Sco-Cen OB association. We identified the transits in the TESS data using our custom notch-filter planet search pipeline, and characterize the system with additional photometry from Spitzer, spectroscopy from SOAR/Goodman, SALT/HRS, LCOGT/NRES, and SMARTS/CHIRON, and speckle imaging from SOAR/HRCam. We model the photometry as a periodic Gaussian process with transits to account for stellar variability, and find an orbital period of 6.9596$^{+0.000016}_{-0.000015}$ days and radius of 10.02$^{+0.54}_{-0.53}$ R$_\oplus$. We also identify a single transit of an additional candidate planet with radius 8.01$^{+0.75}_{-0.71}$ R$_\oplus$ that has an orbital period of $\gtrsim23$ days. The validated planet HIP 67522 b is currently the youngest transiting hot Jupiter discovered and is an ideal candidate for transmission spectroscopy and radial velocity follow-up studies, while also demonstrating that some young giant planets either form in situ at small orbital radii, or else migrate promptly from formation sites farther out in the disk.
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