Kavli Affiliate: Avi Shporer
| Summary:
As part of the KESPRINT collaboration, we present the discovery and characterization of three exoplanets in the sub-Neptune to super-Neptune regime, spanning key regions of the exo-Neptunian landscape. TOI-1472c and TOI-1648b are newly discovered sub-Neptunes, while TOI-1472b is a previously known super-Neptune for which we provide an improved mass measurement. These planets have orbital periods of 6–15 days and radii of 2.5–4.1 R$_oplus$, probing regions where planet formation and atmospheric evolution remain poorly understood. We combine TESS transit photometry with ground-based radial velocities to determine precise masses, radii, and orbital properties. TOI-1472b has a mass of $18.0^+0.84_-0.85$ M$_oplus$ and a radius of $4.06 pm 0.10$ R$_oplus$, TOI-1472c has a mass of $21.1^+0.96_-0.99$ M$_oplus$ and a radius of $3.33 pm 0.08$ R$_oplus$, and TOI-1648b has a mass of $7.4^+1.1_-1.3$ M$_oplus$ and a radius of $2.54^+0.14_-0.12$ R$_oplus$. The planets exhibit a range of eccentricities (0.041–0.178), indicating diverse evolutionary histories. TOI-1648b, with a high Transmission Spectroscopy Metric (TSM $sim$59), is a promising target for atmospheric characterization. Together, these three planets provide precise constraints on the structure, composition, and dynamical evolution of small to intermediate-sized exoplanets, enriching our understanding of the exo-Neptunian landscape.
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