UV irradiation makes water-dominated exoplanet haze analogs more absorbing from 0.5-8 μm, producing a detectable difference in the 2.6 μm N-H feature in modeled transmission spectra for GJ 1214b.
Transmission Spectroscopy of the Habitable Zone Exoplanet LHS 1140 b with JWST/NIRISS
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High-resolution M-band spectroscopy detects super-stellar SiO in TWA 5 B, implying no significant magnesium-silicate clouds and formation consistent with core accretion beyond the CO snowline or gravitational instability with solid enrichment.
JWST NIRISS/SOSS data yield a transmission spectrum of the 23 Myr V1298 Tau c showing H2O absorption and an atmospheric metallicity of 14.8^{+56}_{-12} times solar, lower than mature planets of similar mass.
A data-driven model for periodic ADC integral nonlinearity in JWST/NIRISS is fitted to ramp residuals and applied to correct the ERS1366 WASP-39b transmission spectrum, reducing systematics at the 30ppm level.
POSEIDON now includes lab-derived rocky surface albedos, enabling JWST emission spectra to separate thin versus thick atmospheres and potentially identify granite-like versus basaltic surfaces.
Coupling Bern formation models with extended chemical equilibrium including S and N shows equilibration depletes atmospheric nitrogen, shifts C/O higher outside the ice line, generates Si species, and leaves sulfur abundances weakly dependent on formation location.
Mass of 13.7 Earth masses and density 0.4 g cm^{-3} measured for TOI-1883 b, a super-Neptune in the ridge regime around an early-M dwarf, with implications for disk migration and photoevaporation.
Models coupling hydrogen-silicate-iron miscibility with atmospheric escape reproduce the observed mass-radius occurrence density of sub-Neptunes and super-Earths.
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Ultraviolet Radiation Effects on the Optical Properties of Water-Dominated Exoplanet Hazes
UV irradiation makes water-dominated exoplanet haze analogs more absorbing from 0.5-8 μm, producing a detectable difference in the 2.6 μm N-H feature in modeled transmission spectra for GJ 1214b.