Photochemical Runaway in Exoplanet Atmospheres: Implications for Biosignatures [PDF]
Astrophysical Journal, 2022 About 2.5 billion years ago, microbes learned to harness plentiful solar energy to reduce CO2 with H2O, extracting energy and producing O2 as waste.
S. Ranjan +7 more
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A Temperature Trend for Clouds and Hazes in Exoplanet Atmospheres [PDF]
Astrophysical Journal Letters, 2022 The transmission spectra of exoplanet atmospheres observed with the Hubble Space Telescope (HST) in the near-infrared range (1.1–1.65 μm) frequently show evidence for some combination of clouds and hazes.
R. Estrela, M. Swain, G. Roudier
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Transmission strings: a technique for spatially mapping exoplanet atmospheres around their terminators [PDF]
Monthly notices of the Royal Astronomical Society, 2022 Exoplanet transmission spectra, which measure the absorption of light passing through a planet’s atmosphere during transit, are most often assessed globally, resulting in a single spectrum per planetary atmosphere.
D. Grant, H. Wakeford
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ExoCAM: A 3D Climate Model for Exoplanet Atmospheres [PDF]
The Planetary Science Journal, 2022 The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI) project was initiated to compare 3D climate models that are commonly used for predicting theoretical climates of habitable zone extrasolar planets.
E. Wolf +3 more
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The ExoMolOP database: Cross sections andk-tables for molecules of interest in high-temperature exoplanet atmospheres [PDF]
, 2020 A publicly available database of opacities for molecules of astrophysical interest, ExoMolOP, has been compiled for over 80 species, based on the latest line list data from the ExoMol, HITEMP and MoLLIST databases.
K. L. Chubb +9 more
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Investigating the detectability of hydrocarbons in exoplanet atmospheres with JWST [PDF]
Astronomy & Astrophysics, 2022 Aims. We investigate at what abundances various hydrocarbon molecules (e.g. acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), and methane (CH 4 )) become detectable when observing the atmospheres of various planets using the James Webb Space Telescope (JWST ...
D. Gasman, M. Min, K. Chubb
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The impact of time-dependent stellar activity on exoplanet atmospheres [PDF]
Monthly notices of the Royal Astronomical Society, 2022 M-dwarfs are thought to be hostile environments for exoplanets. Stellar events are very common on such stars. These events might cause the atmospheres of exoplanets to change significantly over time.
A. Louca +5 more
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Annual Review of Astronomy and Astrophysics, 2010 At the dawn of the first discovery of exoplanets orbiting Sun-like stars in the mid-1990s, few believed that observations of exoplanet atmospheres would ever be possible. After the 2002 Hubble Space Telescope detection of a transiting exoplanet atmosphere, many skeptics discounted it as a one-object, one-method success.
Seager, Sara, Deming, Drake
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EXOPLINES: Molecular Absorption Cross-section Database for Brown Dwarf and Giant Exoplanet Atmospheres [PDF]
Astrophysical Journal Supplement Series, 2021 Stellar, substellar, and planetary atmosphere models are all highly sensitive to the input opacities. Generational differences between various state-of-the-art stellar/planetary models arise primarily because of incomplete and outdated atomic/molecular ...
E. Gharib-Nezhad +5 more
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EUV irradiation of exoplanet atmospheres occurs on Gyr time-scales [PDF]
, 2020 Exoplanet atmospheres are known to be vulnerable to mass loss through irradiation by stellar X-ray and extreme-ultraviolet emission. We investigate how this high-energy irradiation varies with time by combining an empirical relation describing stellar X ...
George W. King, P. J. Wheatley
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