TESS Hunt for Young and Maturing Exoplanets (THYME) II: A 17 Myr Old Transiting Hot Jupiter in the Sco-Cen Association

Abstract

We present the discovery of a transiting hot Jupiter orbiting HIP 67522 ($T_{eff}\sim 5650$ K; $M_{\ast }\sim 1.2M_{\odot }$) 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${}_{-0.000015}^{+0.000016}$ days and radius of 10.02${}_{-0.53}^{+0.54}$ R${}_{\oplus }$. We also identify a single transit of an additional candidate planet with radius 8.01${}_{-0.71}^{+0.75}$ R${}_{\oplus }$ that has an orbital period of $\gtrsim 23$ 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.

Submitted to AAS Journals, 19 pages, 10 figures, 6 tables

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