Mini-Neptunes are smaller and farther from their stars, and thus harder to spot, than many other exoplanets.
first tipped off CHEOPS to the presence of these exoplanets; both instruments operate by spotting dips in light caused by exoplanets as they cross, or"transit," the face of their parent star.
TESS spotted single transits of two of the exoplanets, TOI 5678 b and HIP 9618 c — which are about 4.9 and 3.4 times the size of Earth, respectively — as they moved in front of their parent stars. But these observations alone were insufficient to confirm the presence of the planets. "This is where CHEOPS comes into play: Focusing on a single star at a time, CHEOPS is a follow-up mission which is perfect to continue observing these stars to find the missing bits of information," Solène Ulmer-Moll, an astronomer at the University of Bern and the University of Geneva who was involved in the research, said in the statement.
"We then play a sort of 'hide and seek' game with the planets, using the CHEOPS satellite," Osborn said."We point CHEOPS towards a target at a given time, and depending if we observe a transit or not, we can eliminate some of the possibilities and try again at another time until there is a unique solution for the orbital period.
France Dernières Nouvelles, France Actualités
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