TOI-1846 b

TOI-1846 b has a radius of approximately 1.79 ± 0.07 Earth radii (R_⊕), and it completes an orbit around its host star in approximately 3.93 days. While its mass has not been measured, the planet's composition is likely to be water-rich, based on its position in the radius-density diagram. The host star is 47 parsecs (150 light-years) from Earth.

The planet falls within the "small-planet radius valley" and is located in the region known as the "keystone planets". The radius valley separates rocky super-Earths from gaseous sub-Neptunes and is thought to reflect the different formation mechanisms for these planets. The planet's radius and orbital period of 3.93 days make it an important target for studying the boundary between rocky planets and those with significant gaseous envelopes.

No additional planetary signals were found in the system. Transit-timing variations (TTVs) were investigated using TESS and EXOFASTv2, but no TTVs were detected, suggesting that the planet's orbit is stable, with no significant perturbations from additional planets or other sources.

Simulations of transmission spectra using the JWST instruments indicate that the planet could have notable absorption features due to water (H₂O) and methane (CH₄), with the most prominent spectral features detectable in the infrared. Cloud cover is expected to mute the spectral features, particularly in cases of high-altitude clouds.