Youngest co-discoverer of a circumbinary planet

The youngest co-discoverer of a circumbinary planet is Wolf Cukier (USA; b. 4 June 2002), who was 17 years 27 days old on 1 July 2019, when he made the initial observations that led to the discovery of exoplanet TOI 1338 b. This exoplanet is probably a "super-Earth", and orbits a binary star system (two stars orbiting each other).

Wolf spotted the planet while looking through a database of stars imaged by TESS (the Transiting Exoplanet Survey Satellite) during a summer internship at NASA's Goddard Space Flight Center in Maryland, USA. He saw an anomaly in the lightcurve of this particular binary star that was consistent with an exoplanet passing between it and the Earth (what's called a transit).

This discovery was flagged to Wolf's supervisor, Veselin Kostov, who along with colleagues from several other institutions looked through the short- and long-cadence lightcurves TESS had recorded for this system. They were able to find evidence of two additional transits, confirming the initial discovery.

After this, data from large ground based telescopes was used to examine the system in more detail, figuring out the characteristics of the binary system and the one planet confirmed to be orbiting it. This was the first circumbinary exoplanet discovered by the TESS team. The planet is believed to be what's called a "super-Earth", and has a mass 6.9 times greater than our own planet. It completes one orbit every 94 days – roughly the same as the innermost planet of our own Solar System, Mercury.