The Astrophysical Journal, 2023 The atmospheric metallicity greatly influences the composition of exoplanet atmospheres. The effect of metallicity on the thermochemical equilibrium is well studied, though its effect on the disequilibrium abundance is loosely constrained. In this study,
Vikas Soni, Kinsuk Acharyya
doaj +1 more source
Understanding Exoplanet Atmospheres with UV Observations II: The Far UV and Atmospheric Escape [PDF]
arXiv, 2019 Much of the focus of exoplanet atmosphere analysis in the coming decade will be at infrared wavelengths, with the planned launches of the James Webb Space Telescope (JWST) and the Wide-Field Infrared Survey Telescope (WFIRST). However, without being placed in the context of broader wavelength coverage, especially in the optical and ultraviolet ...
arxiv
POSEIDON: A Multidimensional Atmospheric Retrieval Code for Exoplanet Spectra [PDF]
Journal of Open Source Software (2023): 8(81), 4873Spectroscopic observations of exoplanet atmospheres can reveal the chemical composition, temperature, cloud properties, and (potentially) the habitability of these distant worlds. The inference of such properties is generally enabled by Bayesian atmospheric retrieval algorithms.
arxiv +1 more source
Jupiter as an exoplanet: UV to NIR transmission spectrum reveals hazes, a Na layer and possibly stratospheric H2O-ice clouds [PDF]
, 2015 Currently, the analysis of transmission spectra is the most successful technique to probe the chemical composition of exoplanet atmospheres. But the accuracy of these measurements is constrained by observational limitations and the diversity of possible atmospheric compositions. Here we show the UV-VIS-IR transmission spectrum of Jupiter, as if it were
arxiv +1 more source
Distinguishing Oceans of Water from Magma on Mini-Neptune K2-18b
The Astrophysical Journal LettersMildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid-water oceans (“Hycean” planets). The presence of CO _2 and simultaneous absence of ammonia (NH _3 ) in their atmospheres has been proposed as a ...
Oliver Shorttle +4 more
doaj +1 more source
Atmospheric composition of exoplanets based on the thermal escape of gases and implications for habitability [PDF]
, 2020 Samuel Konatham +2 more
openalex +2 more sources
Early Accretion of Large Amounts of Solids for Directly Imaged Exoplanets
The Astrophysical JournalAs the number of planetary-mass objects (PMOs; ⪅13 M _Jupiter ) at wider separation (⪆10 au) grows, there is emerging evidence that they form differently from their higher-mass brown dwarf counterparts.
Ji Wang
doaj +1 more source
Understanding Exoplanet Atmospheres with UV Observations I: NUV and Blue/Optical [PDF]
arXiv, 2019 Much of the focus of exoplanet atmosphere analysis in the coming decade will be atinfrared wavelengths, with the planned launches of the James Webb Space Telescope (JWST) and the Wide-Field Infrared Survey Telescope (WFIRST). However, without being placed in the context of broader wavelength coverage, especially in the optical and ultraviolet, infrared
arxiv
Atmospheric Chemistry of Secondary and Hybrid Atmospheres of Super Earths and Sub-Neptunes
The Astrophysical JournalThe atmospheres of small exoplanets likely derive from a combination of geochemical outgassing and primordial gases left over from formation. Secondary atmospheres, such as those of Earth, Mars, and Venus, are sourced by outgassing. Persistent outgassing
Meng Tian, Kevin Heng
doaj +1 more source
A JWST Panchromatic Thermal Emission Spectrum of the Warm Neptune Archetype GJ 436b
The Astrophysical Journal LettersGJ 436b is the archetype warm Neptune exoplanet. The planet’s thermal emission spectrum was previously observed via intensive secondary eclipse campaigns with Spitzer.
Sagnick Mukherjee +12 more
doaj +1 more source