Through photometry and spectroscopy, we studied the evolution of the activity and chemical composition of comet 67P during its 2025 and 2021 perihelion passages and of comet 103P during its […]
Trans-Neptunian objects (TNOs) in the outer Solar System are predominantly small, icy worlds long presumed to be atmosphereless except for the largest bodies.
Detecting and characterising exoplanet atmospheres remains challenging because atmospheric signals can be comparable to residual noise and instrumental/astrophysical systematics. Spectral features span from a few ppm for small planets up […]
Modeling the interior of a rocky or water-rich exoplanet is a thermodynamic closure problem: every layer’s density, temperature gradient, and phase must follow from an equation of state (EoS) that […]
Measuring the chemical and isotopic compositions of gas giants and brown dwarfs provides insights into their formation pathways and birth environments. 2MASS J0249-0557 c is an L2-type planetary mass companion […]
We present the combined JWST/NIRSpec G395H and NIRISS SOSS transmission spectrum of a warm mini-Neptune, TOI-1130b (3.66 R⊕, 19.8 M⊕, Teq∼825 K). It is part of a rare and unique […]
Past work has shown that ocean salinity and planetary obliquity both influence the climates of Earth-like exoplanets throughout the habitable zone of Sun-like stars. The effects of salinity and obliquity […]
![The measured planet-to-star flux ratio as a function of wavelength compared to a range of solid slab surfaces. The observations were taken using Spitzer (blue square-shaped marker) and JWST (red circle-shaped markers). The error bars on the data are 1σ. A selection of models, taken from Ref. [12], represent solid slab surfaces with varying compositions. Solid orange line: an ultramafic, olivine clinopyroxenite EG-19-63 sample (∼ 47 wt% SiO2) recovered from Emigrant Gap, California, USA, which shows good agreement with the observations. Dashed blue line: a mafic, basaltic sample from the 1919 Kilauea eruption in Hawaii, USA (∼ 51 wt% SiO2) that is also consistent with the data. Dashed, dotted green line: a felsic sample representing the highest SiO2 content model (∼ 73 wt% SiO2) published in Ref. [12]. The legend lists the rejection significances of these models. With a solid black line, we also show a 1000 K black body curve for the planet, which is the best fit value using the combined Spitzer and JWST dataset. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/05/The-dark-and-featureless.png?resize=1200%2C721&ssl=1)
JWST has opened a new era in the study of rocky exoplanets, enabling direct characterization of their surfaces with mid-infrared spectroscopy. Different types of rock have distinct spectral features that […]
Aims. We aim to identify the presence of atomic and molecular species in the upper atmosphere of the warm Neptune-sized transiting planet GJ 436 b, which has a radiative equilibrium […]
The T16 project has produced a uniformly detrended and systematics-corrected set of 83,717,159 TESS Cycle 1 full-frame image light curves for stars observed by TESS in its primary mission down […]
