2020AJ....160...33R

We present the discovery of a transiting hot Jupiter orbiting HIP 67522 (T_eff ∼ 5650 K; M_* ∼ 1.2M_☉) 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_–0.000015^+0.000016 days and radius of 10.02_–0.53^+0.54R_⊕. We also identify a single transit of an additional candidate planet with radius 8.01_–0.71^+0.75R_⊕ that has an orbital period of >=23 days. The validated planet HIP 67522b 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.