TI-DYE. II. HIP 67522 light curves & transit data

The 17 Myr system HIP 67522 is already known to host a giant (~10R_{Earth}_) 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 7.9R_{Earth}_ 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 14.33days, planet c is close to a 2:1 mean-motion resonance with b (6.96days or 2.06:1).