2020/04/30 by Aaron C. Rizzuto, Elisabeth R. Newton, Andrew W. Mann +10 · 1 voice
Physics and Astronomy · #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.3847/1538-3881/ab94b7
Submitted to AAS Journals, 19 pages, 10 figures, 6 tables
arxiv published 2020/04/30 · arxiv created 2020/05/05 · arxiv updated 2020/07/01
We present the discovery of a transiting hot Jupiter orbiting HIP 67522 (Teff∼5650 K; M_* ∼ 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_⊕. We also identify a single transit of an additional candidate planet with radius 8.01+0.75-0.71 R_⊕ 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.