Equilibrium temperature was calculated assuming a Bond albedo of 0.3. Time of inferior conjunction entered under mid-transit time. (Cloutier et al. 2017)

K2-18b has been studied as a potential habitable world that, temperature aside, more closely resembles an ice giant like Uranus or Neptune than Earth. It is the prototype for hycean …

Sep 27, 2019 · Some early models predict that K2-18b’s effective temperature falls somewhere between -100 and 116 degrees Fahrenheit, and if it is about as reflective as Earth, its …

Here, we present an independent reanalysis of the JWST transmission spectrum of the temperate sub-Neptune K2-18 b, to assess the robustness of previously claimed atmospheric detections, …

One of the major developments in the past year has been the first detection of H2O in the atmosphere of the mini-Neptune K2-18b orbiting in the habitable-zone of its host star, with an …

Jul 2, 2025 · K2-18b has a mass of about 8.6 M |$_ {\oplus }$|⁠, a radius of about 2.6 R |$_ {\oplus }$|⁠, and an orbital period of 32.94 Earth days 1 (Montet et al. 2015; Benneke et al. 2019). It …

K2-18b was discovered in 2015 by the Kepler satellite during its K2 mission phase, when the satellite operated with only two of its four gyroscopes. The planet circles the red dwarf star K2 …

Jun 10, 2025 · In this work, we investigate whether a global supercritical water ocean, resembling a planetary-scale hydrothermal system, can explain these observations on K2-18 b-like sub …

GJ 1214b is expected to host super-critical H2 O below the envelope at pressures and temperatures too high to be conducive for life (Rogers & Seager 2010). However, while GJ …

Jul 22, 2025 · This study explores the parameter space of metallicity, C/O ratio, and K zz for K2-18 b using the non-equilibrium chemistry model FRECKLL and JWST data. We generated …