TESS Investigation—Demographics of Young Exoplanets (TI-DYE). II. A Second Giant Planet in the 17 Myr System HIP 67522

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Abstract
The youngest (R ⊕) planet on a tight orbit. In their discovery paper, Rizzuto et al. reported a tentative single-transit detection of an additional planet in the system using TESS. Here, we report the discovery of HIP 67522c, a 7.9 R ⊕ planet that matches with that single-transit event. We confirm the signal with ground-based multiwavelength photometry from Sinistro and MuSCAT4. At a period of 14.33 days, planet c is close to a 2:1 mean-motion resonance with b (6.96 days or 2.06:1). The light curve shows distortions during many of the transits, which are consistent with spot-crossing events and/or flares. Fewer stellar activity events are seen in the transits of planet b, suggesting that planet c is crossing a more active latitude. Such distortions, combined with systematics in the TESS light-curve extraction, likely explain why planet c was previously missed.
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Funding Information
  • NSF ∣ National Science Foundation Graduate Research Fellowship Program (DGE-2040435)
  • NSF ∣ National Science Foundation Graduate Research Fellowship Program (DGE-1650116)
  • National Aeronautics and Space Administration (80NSSC24K0880)
  • National Science Foundation (AST-2143763)
  • National Aeronautics and Space Administration (XRP 80NSSC21K0393)
  • MEXT ∣ Japan Society for the Promotion of Science (JPJP24H00017)
  • MEXT ∣ Japan Society for the Promotion of Science (JPJSBP120249910)

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