Discovery Alert: Mini-Neptune in Double Star System is a planetary puzzle

So the detection of planet TOI 4633 c was a good start. This is not only because its 272-day orbit puts it in fairly exclusive company: so far 175 transiting planets have been found with years longer than 100 days, and only 40 with years longer than 250 days. The planet, detected by TESS (Transiting Exoplanet Survey Satellite), also orbits in the habitable zone, the distance from a star that could allow liquid water to form on a planetary surface. For planet c, of course, that is almost certainly not the case; it most likely has a large, dense atmosphere, perhaps similar to that of Neptune, which would exclude the existence of surface water. A moon could be a solution to this. The longer a planet’s orbital period, the more likely it is to host a satellite, so it’s not difficult to imagine a potentially habitable moon, a la the fictional Pandora. The brightness of this system could make it a likely target in the continued search for such “exomoons.”